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  • Title: SCALA Welcome page
    Descriptive info: .. Welcome to SCALA integrated project website.. Enter public website.. Access to intranet..

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  • Title: SCALA public website
    Descriptive info: Integrated Project.. SIXTH FRAMEWORK PROGRAM - IST PRIORITY.. What is SCALA ?.. Overview.. Partners.. Hot News.. SCALA Events.. QIPC Events.. General Events.. Publications.. Links.. Welcome page.. Contact form.. Benoît Plichon.. Credits.. Go to admin page.. What is SCALA ?.. SCALA Integrated Project.. SCALA.. is Scalable Quantum Computing with Light and Atoms.. Coordinator :.. Philippe Grangier, CNRS - Institut d'Optique, Palaiseau, France.. 5 letters.. Long-term  ...   scalable quantum computer, by using individually controlled atoms, ions and photons to encode, store, process and transmit quantum information.. 2 objectives.. Realization of :.. A).. interconnected.. quantum gates and quantum-wiring elements.. B).. first operational quantum-computing devices.. Examples of experimental techniques :.. Next SCALA event.. 5 March, 2010.. Final Review meeting.. Palaiseau, France.. Read more.. Intranet access.. Registered users may click.. here.. to access intranet homepage..

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  • Title: SCALA public website
    Descriptive info: Overview.. OVERVIEW OF SCIENTIFIC ACTIVITIES.. Content:.. 1.. Summary of the project objectives and organization.. 2.. Contractors involved and coordination activities.. 3.. Objectives and Major achievements of each subproject during Year 2.. 4.. Using and Disseminating Knowledge.. 5.. General assessment of the results of SCALA.. ^Top.. The general long-term goal of the SCALA Integrated Project is the realisation of a scalable quantum computer, by using individually controlled atoms, ions and photons in order to encode, store, process and transmit qubits.. This general goal naturally divides into two more specific objectives, which appear as necessary intermediary steps :.. A) Realize.. interconnected quantum gates and quantum wiring elements.. , which are required as building blocks of a general purpose quantum computer.. B) Realize first approaches of operational quantum computing, which include.. (i).. small-scale quantum algorithms,.. such as quantum error correction.. (ii).. special-purpose quantum processors.. , such as quantum simulators.. (iii).. entanglement-assisted metrology.. The project is designed to foster integration between experimental and theoretical approaches, which include both.. modelizing experiments and improving quantum hardware.. , and attacking long-term issues such as.. quantum simulations.. and.. quantum information theory.. , which will be crucial on the path between the present experimental state of the art, and a scalable general purpose quantum computer.. Both objectives A and B appear to be very important.. realisable.. steps, going towards the general long-term goal of the project.. The tasks of the SCALA partners within objective A will be to combine and integrate all experimental and theoretical activities necessary to realise the.. basic elements of a general purpose scalable quantum computer.. Objective B aims at accomplishing.. non-trivial quantum calculations.. , and though this is quite ambitious, it can reasonably be expected to be successfully achieved within the four years of the duration of SCALA.. In order to attack in a coordinated way its various goals, SCALA is using.. all available experimental and theoretical tools based on trapped atoms, ions and photons.. The experimental research area of the IP, as well as its internal dynamics, are thus based on a set of common tools and methods, defined by the atomic, molecular and optical (AMO) physics that we shall use to reach the planned objectives.. The theoretical research area of the IP obviously also includes AMO physics, but is actually much broader in scope, in order to attack long-term issues which are important on the path between the present experimental state of the art, and a scalable general purpose quantum computer.. One can also note that the objectives A and B given above are associated with two possible routes for achieving scalability.. The first consists of developing the elementary information registers, gates and processors, and then interconnecting and networking them.. Alternatively, one may use the opposite approach and work from the very beginning with large, strongly interconnected, distributed systems, such as atoms in optical lattices.. These kinds of systems are natural candidates for quantum simulators, and the issue is to control them well enough to perform quantum information processing and communication tasks.. Obviously succeeding in combining both approaches - bottom-up and top-down - would be a major achievement for the future of quantum computers.. The general objectives of SCALA allow a very natural division of the RTD activities into four technical sub-projects, denoted below as SP , summarized in the nearby graph.. From the progression of the project, it is expected that the activities in SP1 and SP2 will produce a continuous flow of new techniques, to be used in SP3 and SP4.. On the other hand, the theoretical work carried out in SP3 and SP4 may require the realization of new types of quantum gates or wiring, which will then be implemented in SP1 and SP2.. The resulting flow of information gives the structure of the whole project, as it is summarized by the figure on the right.. It is thus crucial goal to achieve the best possible integration of all these activities, and to optimize the relations between the different subprojects by a careful organization of the internal communications.. This is addressed in the subproject SP0 entitled Management, Communications and Training.. In its second year SCALA has carried out successfully an internal procedure for integrating 11 new groups, corresponding to 8 new legal partners, which started contributing to the work on November 1st, 2007, at the beginning of Year 3.. As it will be seen from the many results obtained this year by the new partners, this allowed us to keep in pace with the rapid emergence of new ideas in all domains which are of fundamental importance for SCALA, and especially quantum simulations.. Presenty the project comprises 26 active legal partners, located in Palaiseau (CNRS.. IO1 and CNRS.. IO2), Paris (CNRS.. ENS), Garching (MPQ.. EX+TH), London (ICSTM.. EX+TH), Innsbruck (IBK.. EX+TH), Barcelona (ICFO.. EX+TH and UAB), Darmstadt (TUD), Düsseldorf (UDUS), Mainz (UMAINZ), Bonn (UBONN), Oxford (UOXF), Cambridge (CAMBRIDGE), Aarhus (UAARHUS), Camerino (UNICAM), Rehovot (WEIZMANN), Gdansk (GUT and UG), Teddington (NPL), Vienna (TUW), Braunschweig (TUBS), Jerusalem (HUJI), Leeds (UNIVLEEDS), Ulm (UULM.. EX+TH), Sussex (UoS), Zurich (ETH) and Florence (LENS).. Overall there is a fair balance between experimental groups (13 old + 7 new = 20) and theory groups (13 old + 4 new = 17), and the partners know each other well, having already collaborated in many instances.. The management office in Palaiseau is in charge of internal and external communication in the project, and the ICFO partner in Barcelona is in charge of Training and Meetings.. In 2008 SCALA has supported several conferences directly related to its activities, where SCALA speakers were invited, and many SCALA team members were present.. Overall the interactions between the project members are excellent, resulting in many joint publications, mostly between the theory teams, but also as collaborations between experimental and theoretical teams.. Objectives and major achievements of each subproject.. This section presents a compilation of the objectives and main achievements of the Integrated Project, on a SubProject and WorkPackage basis.. A more compact summary is given in Section 5.. SP1.. -.. SP2.. SP3.. SP4.. SP1 : Physics of quantum gates and decoherence control :.. This SP is related mainly to objective A, and aims at the development and control of elementary quantum registers, gates and processors.. Major issues are the improvement of the writing, processing and reading of qubits, and the development of new schemes to overcome decoherence.. The experimental tools use atom chips, arrays of optically trapped neutral atoms, cavity QED techniques, and trapped ions.. The theoretical tasks concern new methods for optimizing quantum gates and fighting decoherence, such as optimal control theory, and physical aspects of information processing, such as multi-particle entanglement.. Major achievements in the four WP are listed below.. WP1.. 1 Atom chips for Quantum Information Processing.. Y1 : During Year 1, all the milestones in this atom chips WP have been achieved.. This includes in particular new design of atom chips (ICSTM.. EX, UHEI), high finesse micro optics resonators for qubit detection (CNRS.. ENS, CNRS.. IO, ICSTM.. EX), trapping of atoms in a cryogenic superconducting atom chip (CNRS.. ENS), and the theoretical study of optimized optical quantum gates with static potentials on atom chips (Trento, Aarhus).. Special highlights are a new and versatile method for atom micro manipulation using RF fields, developed by UHEI and not foreseen at the time of SCALA creation, and the first clear detection of single atoms on a chip by CNRS.. ENS.. Double fiber Fabry-Perot resonators for single-atom detection on an atom chip.. (CNRS.. ENS Paris, WP1.. 1).. Mirrors are realized on the fiber tips.. Two fibers mounted face-to-face form a resonator in the gap between the fiber tips, visible in the zoom on the right.. Y2 : In the second year, six out of seven planned milestones have been reached.. In addition, two Y3 milestones were achieved in advance, and a new one was added, on the study of a BEC on a superconducting atom chip (CNRS.. ENS).. Several groups have devised new ways to reduce the noise causing fragmentation on atom chips (ICSTM.. EX, CNRS.. IO2, TUW).. The team in TUW has obtained very nice results about arrays of qubit sites with sizable couplings between them (published in Nature ), and about the detection of single atoms on the chip using tapered fibers (without cavity).. Results have also been obtained by ICSTM and ENS with micro-cavities, including cavity QED effects by dragging a BEC inside a cavity on the chip (CNRS.. ENS, published in Nature ).. Direct observation of the phase dynamics through images of interference patterns in the atomic density distribution for various hold times, in the case of isolated 1D systems (TUW, WP1.. Blue areas indicate zero density, while red areas indicate high atomic density, and white lines show bright nodes.. Y3 : Four out of eight milestones have been reached, and the other four ones have made good progress.. These results include two highlights papers : one by TUW on Probing quantum and thermal noise in an interacting many-body system , and one on a new quantum computing scheme using trapped polar molecules, named Holographic quantum computing , by UAARHUS.. In addition, nice results on atom detection and photon production in a microcavity were obtained by the ICSTM.. EX team, as well as new studies to control the surface roughness in atom chips (CNRS.. IO2), and Bose-Einstein condensation on a superconducting atom chip (CNRS.. Experimental set-up for probing noise in an interacting many-body system (TUW, WP 1.. 1) :.. Two independent 1D Bose gases are created by first splitting a single highly elongated magnetic trap on an atom chip holding a thermal ensemble of atoms into a double well using RF-induced potentials.. In a second step the separate parts are evaporatively cooled to degeneracy, producing two individual 1D condensates The two systems are then simultaneously released from the trapping potential and the resulting interference pattern is recorded with standard absorption imaging.. Y4 : Seven out of nine milestones have been reached or partly reached, one has been cancelled, and one is making progress.. These results include very nice achievements on controlling single atoms on atom chips, including embedded optical fibers, as demonstrated in TUW (without a cavity), and at ENS (with a fiber-based cavity).. There is one highlight paper by ICSTM on this subject, An integrated atom-photon junction , illustrated by the figure below.. In addition, various new designs were successfully implemented, such as silicon pyramid structures (ICSTM), microtraps using super-conducting structures in the critical state (CNRS.. ENS), and monolithic optical cavities (CNRS.. IO).. Schematic diagram of the integrated-waveguide atom chip (ICSTM.. EX).. A silicon substrate supports a layer of silica cladding, within which 4 m-square doped silica waveguide cores are embedded.. There are 12 parallel waveguides (only 4 are shown), with output connected to optical fibres.. A 22 m-deep trench cuts across the waveguides so that 65% of the light from the trench is collected by the waveguides.. An atom in the trench affects the phase and the intensity of the transmitted light, and is also affected by this light, so each waveguide provides a microscopic atom-photon junction.. The top layer of the chip is coated with gold to reflect laser light used for cooling the atoms.. Current-carrying wires below the chip provide magnetic fields to trap and move the atoms.. 2 Addressable arrays of optically trapped neutral atoms.. Y1 : With neutral atoms in optical traps, the expected milestones of demonstrating atom transport with optical micro traps (CNRS-IO1, TUD), and selective transport of individual atoms using an optical conveyor belt and spin state control (MPQ.. EX, UBONN) have both been achieved.. A special highlight are exceptionally long lifetimes (of up to a minute most recently) of single atoms within a high-Q optical cavity, observed by the MPQ.. EX team, and associated with full three-dimensional cooling of the trapped atoms.. Y2 : Two out of three milestones have been reached by several groups simultaneously.. The team CNRS.. IO1 was able to initialize and measure qubits encoded on individual atoms.. By using a photon echo technique, the measured qubit coherence time (40 ms) is up to 106 time longer than the single qubit gate time (40 ns), and is robust when moving the qubit in an optical tweezer.. Experiments about the coherence and the displacements (up to 55 m) of small atomic clouds were also carried out by TUD.. The UBONN team is now successfully operating a new optical dipole trap at the magic wavelength required for spin-dependent transport, including a high-resolution optical system that allows direct continuous monitoring of individual atoms.. First experiments have shown good indications of spin dependent transport.. Y3 : Here 5 out of 6 milestones have been reached.. In particular, cooling of single atoms was achieved in an optical tweezer by an adiabatic method (CNRS-IO) and by a novel sideband cooling technique (UBONN).. For controlling atomic qubits, new results were a Raman technique causing single qubit rotations (CNRS-IO), preliminary results on a spatial single atom interferometer (UBONN), and reduction of dephasing by compensating additional light fields (TUD).. Quantum jumps of a coupled atom-cavity system have been observed for single atoms inserted into a high finesse cavity (UBONN).. On the theory side, optimized control sequences were found for optical potentials allowing faster transport faster and fidelities than adiabatic transport.. This result, obtained from a collaboration between UULM.. TH and the group of Bill Phillips at NIST (USA), is the highlight of this WP for Y3.. Y4 : Here 5 out of 7 milestones have been reached.. In particular, the UBONN team has generated coherent superpositions of quantum product states involving atomic hyperfine states and motional oscillator states.. A novel result on quantum walks using single trapped neutral atoms is a Highlight of the project (see figure below).. The TUD team used focused pairs of laser beams to coherently and site-selectively manipulate internal quantum states of trapped samples of cold atoms.. The CNRS-IO team demonstrated a new method to measure the temperature of a single atom in an optical tweezer, and high-fidelity single-qubit rotation by driving a Raman transition.. Finally, the ULM-TH team has built theoretical models for single-photon nonlinearities using arrays of cold polar molecules.. The nonlinearities result from dipole-dipole interactions of cold polar molecules and implement a two-qubit controlled phase operation between two single photons.. Controlling a quantum walk by time-reversal (UBONN) :.. (A) Time-reversal sequence for refocusing the delocalized state of a six-step quantum walk.. After six steps, the total application of the coin and shift operator is reversed.. (B) The resulting probability distribution shows a pronounced peak at the center, to where, ideally, the amplitude should be fully refocused.. We observe a refocused amplitude of 30%, surrounded by a Gaussian background (fitted curve).. 3 Novel schemes for deterministic quantum gates with trapped ions.. Y1 : For trapped ions, the four expected milestones for Y1 have been completed : Proposal of fast gate operation for ion string (UAARHUS, UOXF), measurement of entanglement witnesses (IBK-EX), design and construction of linear array Penning trap (ICSTM-EX), design of quantum gates between ions in arrays of Penning traps through Coulomb interaction (UNICAM).. In addition, two milestones expected for year 2 have made significant progress : Implementing magnetic-field-independent hyperfine qubits (UOXF), and qubit rotations and gates in decoherence-free subspaces (IBK-EX).. Y2 : Six milestones have been reached, two of them in advance on Y3.. Main experimental results this year are the first observations of ions in microfabricated traps, observation and cooling of small Coulomb crystals in Penning traps, and 2-qubit gate fidelity above 99%.. On the theoretical side, methods for implementing qubits in Penning traps, for moving information along strings of electrons in Paul trap arrays, and new gate methods based on STIRAP and geometric phase have been explored theoretically.. The latter avoid high sensitivity to forces, that limited most previous gate proposals.. Y3 : Three out of five milestones have been reached.. A major result is the realization by the IBK-EX group of single- and 2-qubit logic gates between logical qubits stored in ion pairs, which create decoherence free subspaces.. In parallel, the ICSTM and UOXF groups have developed new types of ion trap array.. The ICSTM group have developed a unique multiple-Penning-trap configuration that operated for the first time this year.. They have been able to observe a very weak magnetic mixing effect through the quantum-jump method, and also controlled movement of ion clouds between trap centers.. The Oxford group implemented a Paul trap array with an unusual design, which will permit a test of a concept for rapidly splitting and combining ion strings.. The Penning trap serves as the context for the theoretical research on quantum communication by spin chains (UNICAM).. Y4 : Four out of ten milestones have been reached, four are in progress, and two have been cancelled.. A major result is the implementation by the IBK.. EX group of a universal set of operations on up to 8 ions at high fidelity.. Using a combination of joint and single-qubit pulses, they report the generation of n-particle entangled cat states from n = 3 at 98.. 7% to n = 8 at 82% fidelity, and also the first deterministic creation of a bound entangled state.. This work is not published yet, but the related Realization of Universal Ion Trap Quantum Computation with Decoherence Free Qubits is a highlight of the project.. The groups in Oxford, Imperial College, Innsbruck and Ulm have developed different types of multiple-electrode trap structure.. The effort worldwide to fabricate small (10 -100 m) ion traps in arrays is continuing despite difficulties, with many traps never functioning or experiencing electrical breakdown after a short lifetime.. Within the SCALA consortium, the Oxford group this year reports a new very stable surface-electrode Paul trap, and the Innsbruck group have implemented operations to shift and swap ions in a trap array.. ICSTM continues to study single ions in Penning traps, and have begun a collaboration with UULM to develop a unique multiple-Penning trap structure.. 4 Theoretical aspects of decoherence control.. Y1 : Theoretical studies in this SP had many milestones, and most of them have been completed : Multilevel equations for storage and gate operations in presence of decoherence-suppressing modulation (WEIZMANN), schemes for the controlled generation of entanglement in atom-cavity systems (ICSTM-TH, UNICAM), derivation of criteria for coherence of time evolutions in open quantum systems (ICSTM-TH), atom-ion interactions for qubit cooling and quantum gate operation (TRENTO), evaluation of effects of decoherence under composite pulses and pulse-shaped driving of quantum gates (AARHUS), quantum interference and adiabatic passage structures with atomic waveguides and cavity QED setups (ICFO-TH).. In addition, the milestone about providing parametrization of noise level in quantum processors has been postponed, and replaced by an unexpected result about macroscopic qubits (UG,GUT).. Y2 In this theoretical WP the 5 planned milestones have been reached, one of them being redefined.. This include schemes for the controlled generation of entanglement in trapped atom and ion systems (ICSTM-TH, UNICAM), and dynamical protection of decoherence (UNICAM, WEIZMANN).. The teams at UG and GUT carried out an analysis of topological codes, where a properly designed self-Hamiltonian is protecting the quantum information, while TRENTO and AARHUS designed schemes using quantum optimal control theory to perform quantum gate operations with robustness against decoherence.. The ICFO postponed the planned work on EIT, but redefined and reached a new milestone on the realization of Mott insulators using ultracold atoms in a standing wave optical cavity.. Y3 : In this WP five milestones have been reached, one related to error correction within a microwave cavity is still in progress, and another one related to interfacing molecular qubits has been redirected One particularly important result is the determination of optimal gates in decoherence-free subspaces (UAARHUS).. It refers to a theoretical proposal on a new scheme for a robust two-qubit gate for Rydberg atomic qubits.. Other results are the study of Surface-induced heating of cold polar molecules by the ICSTM group, as well as results on topological quantum memory for finite temperature (UG) and the emission of entangled light pulses from a single-atom emitter (UNICAM with ICFO and UAB).. Y4 : In this WP seven out of nine milestones have been reached, and two are in progress.. On the other hand two new milestones have been defined and reached, of quite general interest for quantum information.. The first one is related to the derivation of the capability of optimal control theory to reach the ultimate quantum speed limit, and it is the highlight of this WP : Optimal Control at the Quantum Speed Limit by the UULM.. TH group.. The second one concerns the possibility to observe or not sudden death of entanglement when one has only restricted experimental access to a system.. SP2 : Quantum networking and quantum communications :.. The goal of this SP is to employ the  ...   been reached, about advanced error correcting schemes, tools for studying multipartite entanglement, novel application of quantum resources to quantum information tasks, realistic multiphoton scenarios for certain quantum communication tasks and unified approach to dynamical protection of entanglement.. During the reported period several collaborations between UG and GUT, and also between ICFO, HHUD and UG took place.. Another collaboration between ICFO.. TH and MPQ.. TH, on Entanglement percolation in quantum networks , resulted in a publication illustrated on the cover page of Nature Physics in april 2007.. Y3 : Here many milestones were reached (11 out of 15), three are in progress, and one has been redirected.. The two highlights deal with Thermodynamic control by frequent quantum measurements , and with Nonadditivity effects in classical capacities of quantum multiple-access channel.. These results show on the one hand the non-standard behaviour of qubits coupled to heat bath under fast measurements (WEIZMANN, Nature) and the nonadditivity of rate regions for transmission of classical information with multi-access channel (GUT, PRL).. Finally let us stress that collaboration between ICFO and UG, ICFO and IBK.. T1, and also GUT and UG took place in Y3 research.. Y4 : Here most milestones were reached (13 out of 15), and two are in progress.. There are two highlights, dealing with.. M.. ultipartite entanglement detection via structure factors (HHUD), and.. Master Equation and Control of an Open Quantum System with Leakage (WEIZMANN).. Other results by ICFO.. TH, UG, GUT concern various issues about QIPC in distributed quantum systems.. SP4 : Medium and large scale quantum state control and applications :.. This SP also addresses both objectives A and B, i.. e.. quantum state control and applications in quantum statistical systems, such as ion chains, or ultracold atoms in optical lattices.. The possibilities for the implementation of large size atom registers in arrays of microtraps, on microchips, or inside high Q cavities are also studied theoretically and experimentally.. Important issues are the development and implementation of quantum simulators, studies of quantum statistical systems of special significance (such as for instance various types of Hubbard models), quantum phase transitions, quantum state control in distributed systems, and generation of massive entanglement.. Like SP3, this SP evolved significantly due to the addition of new groups.. WP4.. 1 Quantum state engineering and control in distributed systems.. Y1 : All Y1 milestones were completed : Analysis of robustness of state transfer and other components of always-on QIP (CAMBRIDGE), schemes for cooling atoms moving in an optical lattice (IBK.. TH), internal-translational entanglement schemes of cold-atom interferometry (WEIZMANN).. In addition, CAMBRIDGE have made progress on the Y2 milestone : New primitives for quantum computing based on spin systems with always-on interaction.. Similarly WEIZMAN has partly realized its Year 2 milestone as well.. Finally, UDUS, has already achieved a Year 2 milestone : Determination of maximal nearest neighbour entanglement in XXZ spin chains.. Theoretical design of Spin Lattice Hamiltonians with Polar Molecules in Optical Lattices.. T1Innsbruck, WP4.. This is illustrated from two models:(a) gapped model with error tolerant 2-fold degenerate ground states, and (b) Kitaev s model with anyonic excitations and ground states allowing for topologically protected quantum memory.. Y2: The five Y2 milestones have all been reached, about fault-tolerant quantum computation based on 'always-on-interaction', quantum phase transitions in optical lattices (CAMBRIDGE), studies of the Bose-Hubbard model with dissipation via phonon cooling (IBK.. T2), entangled state interferometry in ultracold atomic systems (WEIZMANN).. Overall, many theoretical problems have been studied, ranging from efficient initialization of quantum registers in atomic lattices, and the quantum simulation abilities of doped coupled cavity arrays, up to implementation issues such as the preparation of cluster states, reproduction of spin models in coupled cavities, and detection of multi-particle entanglement.. Y3 : In this WP ten out of fourteen milestones were reached, including one highlight on Quantum States and Phases in Driven Open Quantum Systems with Cold Atoms , which deals with schemes to exploit dissipative coupling to phonon baths as a means of preparing many-body states of atoms in optical lattices.. A variety of other theoretical problems was studied, ranging from efficient initialization of quantum registers in atomic lattices to the characterization of entanglement in spin chains, as well as experimental issues, including preparation of cluster states and detection of multi-particle entanglement.. Y4 : In this WP nine out of twelve milestones were reached, including two highlights : the proof of the quantum analogue of the Local Lovasz Lemma, by which significant improvements about the threshold for the satisfaction of random quantum SAT instances were derived, and the experimental investigation of the spin dynamics of one and two neutral atoms strongly coupled to a high finesse optical cavity, with quantum jumps between hyperfine ground states of a single atom.. Other results address theoretical problems ranging from efficient initialization of quantum registers in atomic lattices, to the characterization of entanglement in spin chains, as well as experimental issues, including preparation of cluster states and detection of multi-particle entanglement.. 2 Cold atoms and ions as quantum simulators.. Y1 : There was two theoretical milestones in Y1, which have both been completed, about quantum optical systems to implement quantum simulators (MPQ.. TH, UDUS), and classical algorithms for quantum simulation in 1D (MPQ.. Experimental milestones are expected for the next periods.. Y2 : Five out of six Y2 milestones have been reached, and the central achievements are about simulating complex many-body quantum systems using atoms and photons, and analyzing algorithms to describe those systems, specially in two spatial dimensions.. This concerns cold-atom quantum simulators of strongly interacting particles, and optical detection of the quantum phases (HHUD, TUD, MPQ.. TH), quantum simulations with trapped ions (MPQ.. TH), and the possibility to realise and detect excitons using cold atoms in optical lattices (IBK.. A new unexpected result was the demonstration of entanglement percolation in quantum networks, done in collaboration between MPQ.. TH and ICFO.. TH.. On the experimental side, ICSTM.. EX has been working to integrate microscopic optical devices into atom chips in order to detect small numbers of atoms, in order to eventually manipulate large atom arrays as quantum simulators.. Left : cover of Nature Physics, April 2007, Volume 3, No 4, about Entanglement Percolation in Quantum Networks (MPQ.. TH, WP 4.. Right : Quantum noise correlation of a charge density wave (CDW) type ordering prepared using an optical superlattice.. The CDW is revealed by observing the distance of the noise correlation peaks in the horizontal being half as large as the distance along the vertical direction (U.. Mainz, WP4.. 3).. Y3 This WP is split in a theoretical and an experimental part, with the central goals of simulating complex many-body quantum systems using atoms and ions, as well as analysing of new theoretical methods to describe those systems.. all devoted to quantum simulations of complex quantum systems.. Six out of twelve milestones were reached, and most of the other ones made good progress.. The WP includes three highlights, on Simulation of Quantum Many-Body Systems with Strings of Operators and Monte Carlo Tensor Contractions (MPQ.. TH), ] Simulating the quantum magnet with trapped ions (MPQ.. EX2), and A Mott insulator of fermionic atoms in an optical lattice (ETH).. Y4 : This WP, in which 13 out of 15 milestones have been reached, is split in a theoretical and an experimental part, with the central goals of simulating complex many-body quantum systems using atoms and ions, as well as analysing new theoretical methods to describe those systems.. Three major highlights of this workpackage for the current year concern Quantum computation and quantum-state engineering driven by dissipation (MPQ.. TH), Quantitative Determination of Temperature in the Approach to Magnetic Order of Ultracold Fermions in an Optical Lattice (ETH), and Symmetry breaking in quantum systems : the case study of vortex nucleation.. This work constitutes a paradigm example of symmetry breaking/change of the order parameter of quantum many-body systems in the course of adiabatic evolution (see figure below).. Vortex nucleation in quantum systems (WP4.. 2).. Density of the ground state and phase maps of the first (.. y1) and second (y2) most populated states, for two different values of the rotation frequency W for N=6 particles, upper : W = Wc, lower : W = 1.. 03 Wc.. The first column is the contour plot of the total density, and the second and third columns show the local phase maps of y1 and y2, respectively.. Vortices are localized at the singularities of the phase maps, surrounded by diffuse change of the phase.. This figure shows that the nucleation of the first centered vortex in a rotating condensate by a slow frequency sweep does not occur through a smooth entrance of the vortex.. The system passes through a correlated, non-mean-field state where two single-particle states have equal weight.. 4 : The UIBK.. EX group has performed precision spectroscopy of the S1/2-D5/2 line of 40Ca+ and 43Ca+, for determining the isotope shift, which are of paramount importance for employing this ion as a qubit.. The UAARHUS group has started to develop the theoretical treatment of large collection of atoms which can become spin squeezed.. At NPL a segmented linear trap had been designed for the planned experiments with 88Sr+, but due to fabrication problems a conventional linear trap has been realised.. The CNRS-ENS plans to develop cavity QED experiments based on mesoscopic atomic samples were delayed because the cavity QED set-up was used for the unexpected milestones reported in WP3.. 1.. 3 Disordered cold atom and ion systems.. Y1 : This very rich WP achieved a large number of milestones, both theoretical : Identification and proposals for realisations of various interesting disordered systems of various kinds (ICFO.. TH), characterization of entanglement properties of weighted graph states (IBK.. T1), measurement scheme for q-overlap in disordered Bose-Hubbard model (IBK.. T2), illustration of measurement procedure for disordered 1D BH model (IBK.. T2), and experimental : Two-atomic species loading of atoms in optical lattice potentials (UMAINZ), creation of short ranged disorder via a second atomic species in the lattice potential (UMAINZ).. The last milestone : Characterization and arbitrary manipulation of 1d disorder potentials (UHEI), though not fully completed, has also made very good progress.. Y2 Seven out of eight milestones have been reached, including the investigation of several Hamiltonians which can be simulated experimentally, and the interplay of entanglement and frustration in disordered quantum systems (ICFO.. The IBK.. T1 team has continued to investigate the thermodynamical and quantum mechanical properties of disordered systems, using weighted graph states.. The CNR Trento team has obtained unexpected results, on the entanglement in quantum disordered systems with an Ising-type interaction, and their potential for quantum information processing.. On the experimental side, the UMAINZ team has carried out detailed studies of Bose-Fermi mixtures in 3D optical lattices, and specifically investigated the influence of the fermionic species on the coherence properties of the bosonic superfluid component.. Furthermore, the team has realized for the first time superexchange spin-spin interactions between atoms in superlattices.. The TUW team has performed in-depth studies on the spectrum and height dependence of disorder potentials in atom chips.. Especially, the scaling of corrugation amplitude and frequency with atom-wire separation is now well understood.. Y3 : : In this WP, three milestones were fully reached, two are in progress, and one is postponed.. In addition, two other milestones were partly reached, and give rise to two highlights : Metallic and Insulating Phases of Repulsively Interacting Fermions in a 3D Optical Lattice (UMAINZ), and Anderson localization of a non-interacting Bose-Einstein condensate (LENS).. Other topics are the detection of correlations in disordered quantum systems, the effect of dipolar interactions for the generation of novel complex quantum phases and also the effect of fermionic quantum gases in an optical resonator (ICFO).. T1 has focussed the work on thermodynamical and quantum mechanical properties of disordered systems, and IBK.. T2 on weighted graph states, which are good candidates for the numerical simulation of quantum systems.. Furthermore, general entanglement properties of condensed matter systems and the algorithmic complexity of solving classical spin models were addressed in the work of Year 3.. Cloud sizes of repulsively interacting spin mixture versus compression (UMAINZ, WP4.. The cloud size is measured as a function of the external trapping potential for various interactions.. Dots denote single experimental shots, lines denote the theoretical expectations.. The insets (A to E) show the- quasi-momentum distribution of the noninteracting clouds (averaged over several shots).. The inset (F) shows the resulting cloud size for different lattice ramp times, for a noninteracting and an interacting Fermi gas.. The arrow marks the actial ramp time of 50 ms.. These experimental results demonstrate the potential to model interacting condensed-matter systems using ultracold fermionic atoms.. 4 Entanglement and quantum correlations for precise metrology.. Y1 : In this WP two theoretical milestones have been completed : Determination of the interferometric phase sensitivity with separate squeezing of two atomic ensembles (UDUS), and detailed studies of squeezing and its application in precision probing (UAARHUS).. One of the experimental milestone has been completed : Absolute frequency measurement of Ca+ S-D transition with a single ion (IBK.. EX), and actually a Y2 milestone on the same experiment wera also achieved, about the absolute electric quadrupole moment of Ca+ (IBK.. The two other experimental milestones, though not fully completed, have made very good progress : Observation of 2-ion entanglement (NPL), and preparation of mesoscopic atomic samples (CNRS.. Y2 : The UIBK.. The CNRS.. ENS plans to develop cavity QED experiments with mesoscopic atomic samples were delayed, because the cavity QED set-up was used for the unexpected milestones reported in WP3.. Y3 : Two out of four milestones have been reached.. In particular, the UAAHRUS group has developed a general theoretical description of the continuous probing of a squeezed atomic sample coupled to an optical cavity.. Optimal probing strategies as well as the use of feedback for reaching a desired state were investigated.. EX group, have performed precision spectroscopy of the S1/2-D5/2 line of 40Ca+.. Together with measurements performed with 43Ca+, this study provides a precise understanding of the level spectrum and of systematic shifts of the considered quadrupole transition.. This is of great importance for employing it as a qubit.. Y4 : In this WP most milestones were reached already in previous periods (IBK.. EX), or have been redirected to other WP (CNRS.. During year 4 one out of three milestones has been reached, and two others are still in progress at NPL, to achieve 2-ion entanglement within one segment of a linear trap, because two kind of traps were investigated and have both presented difficulties.. The main channel for using and disseminating knowledge is through scientific publications, and communication to conferences.. The scientific production of SCALA along the four years of the project is shown in the table below :.. it should be noticed that SCALA results have been disseminated by more than 500 invited talks and 1000 articles, including 200 high impact publications.. Most of these results have been already exploited within the Project, as a way to achieve its objectives.. Year 1.. Year 2.. Year 3.. Year 4.. Total.. Letters in high-impact journals (Nature, Science, PRL).. 27.. 48.. 64.. 59.. 198.. Articles in international refereed journals (PRA etc).. 100.. 122.. 143.. 106.. 471.. Articles in Books and Proceedings.. 11.. 19.. 12.. 53.. Preprints (arXiv).. 62.. 84.. 91.. 105.. 342.. Total Articles.. 200.. 265.. 317.. 282.. 1064.. Invited Talks in International Conferences.. 90.. 140.. 182.. 92.. 504.. Miscelleanous Communications (oral or posters).. 150.. 225.. 199.. 409.. 973.. Seminars, Colloquium.. 60.. 85.. 124.. 123.. 392.. Total Communications.. 300.. 450.. 495.. 624.. 1869.. The list of publications acknowledging SCALA has been published on this website.. Click here.. The other instruments which are used for disseminating knowledge are :.. Through the industrial and commercial involvement of the partners,.. which are used to disseminate and exploit the spinoffs of the project in the best possible way.. Through project clustering and collaboration within the FET QIPC cluster,.. in close contact with the QIPC Coordination Actions QUROPE , especially for joint conferences.. Through the web site.. http://www.. scala-ip.. org/.. The webpage is linked to the existing webpages of the individual partners, and it has a private part which has been used a communication tool between the partners, especially for preparing the reports.. General assessment of the results in SCALA.. Beyond the very large number of results and publications listed in sections 3 and 4, it is interesting to assess how well the general objectives listed in section 1 have been achieved.. Without quoting again the groups names, which are spelled out in section 4, here are some general statements.. This was essentially the objective of SP1 and SP2, which have met many success, among which :.. * very significant progress in manipulating single trapped material particles : single atoms on chips, in free space, in cavities, single ions in many kinds of traps.. All aspects of the manipulation have been considerably improved, especially for neutral atoms : writing a single qubit, reading it out, driving it with high fidelity, shuttling it, all this both in free space and in cavities.. With trapped ions, record values in the fidelity of single qubit manipulations have been reached, e.. 99.. 9%.. * very significant progress in producing tailored , indistinguishable, single photons with high count rate, from either trapped atoms in free space, or from cavity QED systems with atoms or ions.. This includes also the production of entangled photon pairs, or of entangled atom-photon systems, as well as using parametric photons as atomic probes.. Interconnecting quantum gates seems in view.. * in addition to optical photons, long-range Rydberg interactions have been used in several contexts : with high finesse microwave cavities (see below), but also without cavities, as a way to deterministically entangle two neutral atoms, as proposed by the Innsbruck group in 2000.. These new experimental developments have stimulated many new theoretical ideas by SCALA theory groups, which turn out to be very important for new post-SCALA projects.. * at the theory level, many results relative to quantum networks have been obtained, both on the more abstract side of quantum information theory, and on a more experiment-oriented side.. In addition, as recommended by the referees during the negociation of the project, several new groups have significantly added to SCALA expertise and productivity in (quantum) computer science.. This was essentially the objectives of SP3 and SP4, which have also met many success.. * For objective B(i), two implementations were considered.. For trapped ions, many very spectacular results were obtained, including the preparation of a quantum byte in a W state, QND measurements and elementary quantum error correction (with 3 qubits), composite (two-ions) decohence-free qubits, and many others.. A second implementation is microwave photons in superconducting cavity, which has reached during SCALA an unprecedented level of control, based on super-long-lived cavities (0.. This allowed to carry out repeated measurements and tomography of quantum states up to 7 photons, to prepare Fock states and Schrödinger cat states, and to study their decoherence.. Although these experiments are not quantum computing as such, they deal with questions which are just the ones which will arise in a computer : influence of losses, of thermal excitations, possibility to apply quantum feedback, etc.. One can thus conclude that objective B(i) has indeed be achieved.. * Objective B(ii) was not strongly emphasized at the beginning of the project, but it has been boosted by the addition of new SCALA groups.. It is probably the one where achievements go further beyond expectations, and one can tell that now the quantum simulator concept is essentially validated.. A confirmation is that this subject now attracts the attention of top-notch solid-state physicists, who are actively collaborating with SCALA groups (see e.. highlights in Year 4).. Again, it is fair to say that objective B(ii) has been reached, and has also stimulated many more present developments.. * Finally, the main results in objective B(iii) was obtained during Y2 and Y3, about ultra-precise measurements assisted by entanglement.. Though this is quite significant, the general outcome seems here to remain below expectations.. This is partly because some groups redirected their effort towards other goals, and other groups met unexpected difficulties.. Clearly the issue of quantum metrology remains quite important, and post-SCALA projects will have to deal again with it.. Overall, it seems fair to say that SCALA has reached its objectives, and has also contributed to develop new promising fields, such as quantum simulators, and hybrid systems , which appeared during the project without being an explicit objective.. In the future, very large projects like SCALA may be harder to organize and to fund, but smaller projects will also be able to progress further towards the realisation of a scalable quantum computer, both on theoretical and on the experimental side.. Scala - March 2010..

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    Descriptive info: Partners.. Click on opposite map to find out countries involved in the project.. Or click.. to view full partners list in a new window.. gathers 38 partners from 10 different countries :.. Austria.. Denmark.. France.. Germany.. Italy.. Israel.. Poland.. United Kingdom.. Spain.. Switzerland..

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    Descriptive info: Hot News.. Available soon..

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    Descriptive info: SCALA Events.. All years |.. 2007.. |.. 2008.. 2009.. 2010.. 6 SCALA events.. Link.. Info.. Event.. Place and date.. SCALA 2nd annual meeting.. 2nd annual meeting of SCALA, General assembly, Steering Committee meetings, poster session.. PARIS, College de France, IHP.. January 22-23, 2007.. QIPC 2007.. International Conference on Quantum Information Processing and Communication.. Barcelona..  ...   steering committee meetings, general assembly, poster session.. MAINZ.. January 23-25, 2008.. SCALA Conference 2009.. International Conference on Scalable Quantum Computing with Light and Atoms.. Cortina, Italy.. February 15-22, 2009.. SCALA Summer School.. Summer School on Scalable Quantum Computing with Light and Atoms.. Cargèse, Corsica, France.. August 17-28, 2009.. Review of the last periodic report..

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    Descriptive info: QIPC Events.. 3 Cluster Review Meetings.. QIPC Meeting.. QIPC Cluster Review Meeting.. IHP, Paris, France.. March 3-7, 2008.. QCCQI - Qurope Workshop.. Quantum/Classical Control in Quantum Information.. Otranto, Italy.. September 13-20, 2008.. Announcement of Feature issue on Quantum Optical Information Technologies.. This feature issue will bring together scientists who are actively researching towards the realization of quantum information processing and other quantum technologies, with special focus on photonic implementations.. Original theoretical and experimental papers are sollicited from all current areas of work.. -.. Submission Deadline: 1 November, 2009..

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    Descriptive info: General Events.. 3 general events.. MAPPI -Modern Application of Trapped Ions.. International Training School.. Les Houches, France.. May 18-23, 2008.. Solvay workshop.. Bits, Quanta, and Complex systems: modern approaches to photonic information processing.. Brussels.. April 30 -May 3, 2008.. FET 09.. Science beyond Fiction - The European Future Technologies conference.. Prague.. April 21-23, 2009..

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    Descriptive info: Publications.. Publications of the SCALA consortium (2008-2009).. Click here to see the publications 2007-2008.. Click here to see the publications 2006-2007.. Click here to see the publications 2005-2006.. Letters in high-impact journals (Nature, Science, Physical Review Letters).. :.. Articles in international refereed journals (Physical Review A etc) : 106.. Articles in Books and Proceedings : 12.. Preprints (arXiv) : 105.. Total number of SCALA publications during Year 4 : 282.. Detailed list, arranged by contributing group :.. 1 CNRS CNRS.. IO1 Philippe Grangier, Antoine Browaeys (Orsay).. Observation of collective excitation of two individual atoms in the Rydberg blockade regime , A.. Gaëtan, Y.. Miroshnychenko, T.. Wilk, A.. Chotia, M.. Viteau, D.. Comparat, P.. Pillet, A.. Browaeys, P.. Grangier, Nature Physics 5, 115 (2009).. Entanglement of two individual neutral atoms using Rydberg Blockade , T.. Gaëtan, C.. Evellin, J.. Wolters, Y.. Miroshnychenko, P.. Grangier and A.. Browaeys, arXiv:09080454, to appear in Phys.. Lett (2010).. ^.. TOP.. IO2 Alain Aspect, Christoph Westbrook (Orsay).. Towards a monolithic optical cavity for atom detection and manipulation , S.. Gleyzes, A.. El Amili, R.. Cornelussen, P.. Lalanne, C.. I.. Westbrook, A.. Aspect, J.. Estève, G.. Moreau, A.. Martinez, X.. Lafosse, L.. Ferlazzo, J.. -C.. Harmand, D.. Mailly, A.. Ramdane, Eur.. Phys.. J.. D 53, 107 (2009), arXiv:0901.. 0513.. Atom Chips: Read the Labels , C.. Westbrook, Nature Physics (News and Views) 5, 538 (2009).. Atom chips and one dimensional Bose gases , I.. Bouchoule, N.. J.. van Druten, C.. Westbrook, to appear in Atom Chips J.. Reichel and V.. Vuletic, Eds.. (Wiley, Weinheim, 2010), arXiv:0901.. 3303.. ENS Jean-Michel Raimond, Michel Brune (Paris).. Measurement of the trapping lifetime close to a cold metallic surface on a cryogenic atom-chip , k A.. Emmert, A.. Lupascu, G.. Nogues, M.. Brune, J.. M.. Raiond, S.. Haroche, Eur.. D 51, 173 (2009).. Quantum feedback by discrete quantum nondemolition measurements: towards on-demand generation of photon-number states , I.. Dotsenko, M.. Mirrahimi, M.. Brune, S.. Haroche, J.. Raimond, P.. Rouchon, Phys.. A.. 80, 013805 (2009).. Effect of vortices on the spin-flip lifetime of atoms in superconducting atom-chips , G.. Nogues, C.. Roux, T.. Nirrengarten, A.. Lupascu, A.. Emmert, M.. Raimond, S.. Haroche, B.. Plaçais, J.. Greffet, EPL 87, 13002 (2009).. Mircrotraps for neutral atoms using superconducting structures in the critical state , A.. Lupascu, M.. Haroche, G.. Nogues, Phys.. A; In print.. Manipulating and probing microwave fields in a cavity by quantum non-demolition photon counting , S.. Haroche, I.. Dotsenko, S.. Deléglise, C.. Sayrin, X.. Zhou, S.. Gleyzes, C.. Guerlin, S.. Kuhr, M.. Brune and J-M.. Raimond, Physica Scripta in print.. ENS2 Jean Dalibard, Michel Salomon Michel Brune (Paris).. Microwave Control of Low-Energy Atomic Collisions , D.. Papoular, G.. V.. Shlyapnikov, J.. Dalibard, arXiv:0909.. 4633:.. Exploring the Thermodynamics of a Universal Fermi Gas , , S.. Nascimbène, Nir Navon, K.. Jiang, F.. Chevy, C.. Salomon, arXiv:0911.. 0747, submitted to Nature.. Ground state of a tightly bound composite dimer immersed in a Fermi Sea , C.. Moran and F.. Chevy, Phys.. A 80 033607 (2009).. Collective Oscillations of an Imbalanced Fermi Gas: Axial Compression Modes and Polaron Effective Mass , S.. Jiang, L.. Tarruell, M.. Teichmann, J.. Mckeever, F.. Salomon, Phys.. 103, 170402 (2009).. Symmetry breaking in quantum systems: the case study of vortex nucleation , D.. Dagnino, N.. Barberan, M.. Lewenstein, J.. Dalibard, Nature Physics 5, 431-437 (2009).. (see also: News and Views by Jacob A.. Dunningham, Nature Physics 5, 381-381June 2009)).. Practical scheme for a light-induced gauge field in an atomic Bose gas , K.. Günter, M.. Cheneau, T.. Yefsah, S.. P.. Rath, and J.. Dalibard, Phys.. A 79,011604(R) (2009).. Geometric potentials in quantum optics: A semi-classical interpretation , M.. Cheneau, S.. Rath, T.. Yefsah, K.. Günter, G.. Juzeliunas, and J.. Dalibard, Europhysics Letters 83, 60001 (2008).. Many-Body Physics with Ultracold Gases , I.. Bloch, J.. Dalibard, and W.. Zwerger, arXiv:0704.. 3011, Reviews in Modern Physics 80, 885 (2008).. The trapped two-dimensional Bose gas: from Bose-Einstein condensation to Berezinskii-Kosterlitz-Thouless physics , Z.. Hadzibabic, P.. Krüger, M.. Rath, J.. Dalibard, New J.. 10, 045006 (2008).. 2 MPQ MPQ.. EX1 Gerhard Rempe (Garching).. Cavity Quantum Electrodynamics and Cold Polar Molecules , P.. W.. H.. Pinkse, Habilitation, Technische Universität München (2008).. Fast Excitation and Photon Emission of a Single-Atom-Cavity System , J.. Bochmann, M.. Mücke, G.. Langfahl-Klabes, C.. Erbel, B.. Weber, H.. Specht, D.. L.. Moehring, and G.. Rempe, Physical Review Letters 101, 223601 (2008).. Two-photon gateway in one-atom cavity quantum electrodynamics , A.. Kubanek, A.. Ourjoumtsev, I.. Schuster, M.. Koch, P.. H.. Pinkse, K.. Murr and G.. Rempe, Physical Review Letters 101, 203602 (2008).. Photon-Photon Entanglement with a Single Trapped Atom , B.. Specht, T.. Müller, J.. Mücke, D.. Moehring, G.. Rempe, Physical Review Letters 102, 030501 (2009).. Phase shaping of single-photon wave packets , H.. Specht, J.. Mücke, B.. Weber, E.. Figueroa, D.. Rempe, Nature Photonics 3, 469 (2009).. Phasen eines Photons , G.. Rempe, Physik in unserer Zeit 40, 274 (2009).. Photon-by-photon feedback control of a single-atom trajectory , A.. Kubanek, M.. Koch, C.. Sames, A.. Ourjoumtsev, P.. Rempe, Nature (submitted 17 August 2009, accepted 7 October 2009).. EX2 Tobias Schaetz (Garching).. The quantum Walk of a trapped Ion in phase space , H.. Schmitz, R.. Matjeschk, Ch.. Schneider, J.. Glueckert, M.. Enderlein, T.. Huber, T.. Schaetz, Phys.. Rev.. Lett.. 103, 090504 (2009).. The arch of simulating Quantum Spin Hamiltonians with trapped Ions , H.. Schmitz, A.. Friedenauer, J.. Glueckert, C.. Schneider, M.. Enderlein, D.. Porras and T.. Schaetz, Applied Physics B 95, 195 (2009).. TH Ignacio Cirac (Garching).. Quantum computation, quantum state engineering, and quantum phase transitions driven by dissipation , F.. Verstraete, M.. Wolf, J.. I.. Cirac, Nature Physics 5, 633-636 (2009);.. Computational complexity of interacting electrons and fundamental limitations of density functional theory , N.. Schuch, F.. Verstraete, Nature Physics 5, 732-735 (2009);.. Ground-State Properties of Quantum Many-Body Systems: Entangled-Plaquette States and Variational MonteCarlo , F.. Mezzacapo, N.. Schuch, M.. Boninsegni, J.. Cirac, New J.. Physics 11 083026 (2009);.. Simulations of quantum double models , G.. K.. Brennen, M.. Aguado, J.. Physics 11 053009 (2009);.. How long can a quantum memory withstand depolarizing noise? , F.. Pastawski, A.. Kay, N.. Schuch, I.. Cirac,Phys Rev.. 103, 080501 (2009);.. Dynamical creation of a supersolid in asymmetric mixtures of bosons , T.. Keilmann, J.. Cirac, T.. Roscilde, Phys Rev Lett.. 102, 255304 (2009);.. Matrix Product States for dynamical simulation of infinite chains , M.. C.. Bañuls, M.. B.. Hastings, F.. Verstraete, J.. Cirac, Phys.. 102, 240603 (2009);.. Optimal Surface-Electrode Trap lattices for quantum simulations with trapped Ions , R.. Schmied, J.. Wesenberg, D.. Leibfried, Phys.. 102, 233002 (2009);.. Exploring frustrated spin-systems using Projected Entangled Pair States (PEPS) , V.. Murg, F.. Cirac Phys Rev.. B 79, 195119 (2009);.. Nonequilibrium reliability of quantum memories , A.. Kay, Phys.. lett.. 102 070503 (2009);.. Quantum simulations based on measurements and feedback control , K.. G.. Vollbrecht, J.. A 79, 042305 (2009);.. Critical exponents of 1D quantum critical models by means of MERA tensor network , S.. Montangero, M.. Rizzi, V.. Giovannetti, R.. Fazio, Phys.. B 80, 113103.. Homogeneous multiscale-entanglement-renormalization-ansatz states: an information theoretical analysis , V.. Giovannetti, S.. Rizzi, R.. A 79, 052314 (2009);.. Effective mapping of spin-1 chains onto integrable fermionic models.. A study of string and Neel correlation functions , C.. Degli Esposti Boschi, M.. Di Dio, G.. Morandi, M.. Roncaglia, J.. A: Math.. Theor.. 42 055002 (2009);.. Thermal states of anyonic systems , S.. Iblisdir, D.. Pérez-García, M.. K.. Pachos, arXiv:0812.. 4975v1;.. Quantum computation in correlation space and extremal entanglement , J.. Cai, W.. Dür, M.. van den Nest, A.. Miyake, H.. Briegel, arXiv: 0902.. 1097v2;.. Interfacing nuclear spins in quantum dots to cavity or traveling-wave fields , H.. Schwager, J.. Cirac, G.. Giedke, arXiv:0903.. 1727;.. Fermionic Projected Entangled Pair States , Ch.. V.. Kraus, N.. Cirac, arXiv:0904.. 4667;.. Hawking Radiation from an Acoustic Black Hole on an Ion Ring B.. Horstmann, B.. Reznik, S.. Fagnocchi, J.. 4801;.. Pfaffian State Generation by Strong 3-Body Dissipation M.. Roncaglia, M.. Rizzi, J.. Cirac, arXiv:0905.. 1247;.. Quantum Operations and Metrology with Entangled Electrons in a Penning Trap L.. Lamata, D.. Porras, J.. Cirac, J.. Goldman, G.. Gabrielse arXiv:0905.. 0644;.. Quantum complex network , S.. Perseguers, M.. Lewenstein, A.. Acín, J.. Cirac, arXiv:0907.. 3283;.. A canonical form for Projected Entangled Pair States and applications , D.. Perez-Garcia, M.. Sanz, C.. E.. Gonzalez-Guillen, M.. Cirac, arXiv:0908.. 1674; NOT SCALA !?.. Simulating two- and three-dimensional frustrated quantum systems with string-bond states , A.. Sfondrini, J.. Cerrillo, N.. Schuch, J.. 4036v1;.. Towards quantum superposition of living organisms , O.. Romero-Isart, M.. L Juan, R.. Quidant, J.. Cirac, arXiv:0909.. 1469v2;.. Renormalization and tensor product states in spin chains and lattices , J.. Cirac, F.. Verstraete, arXiv:0910.. 1130v1;.. Matrix Product State and mean field solutions for 1D systems can be found efficiently , N.. Schuch, J.. Cirac, arXiv:0910.. 4264v1;.. Electrostatics of gapped and finite surface electrodes , R.. Schmied, arXiv:0910.. 4517;.. 3 IMPERIAL ICSTM.. EX Ed Hinds, Danny Segal (London).. Integrated magneto-optical traps on a chip using silicon pyramid structures , S.. Pollock, J.. Cotter, A.. Laliotis and E.. Hinds, Optics Express, 17 p14109 (2009).. Fabrication of Magnetooptical Atom Traps on a Chip , G.. Lewis, Z.. Moktadir, C.. Gollasch, M.. Kraft, S.. Pollock, F.. Ramirez-Martinez, J.. Ashmore, A.. Laliotis, M.. Trupke, E.. Hinds, J.. MEMS, 18 p347 (2009).. Momentum Exchange between Light and a Single Atom: Abraham or Minkowski? , E.. A.. Hinds and S.. Barnett, Phys.. , 102 050403 (2009).. An integrated atom-photon junction , M.. Kohnen, M.. Succo, P.. G.. Petrov, R.. Nyman, M.. Trupke, E.. Hinds, arXiv:0912.. 4460, submitted to Nature Photonics.. Bloch-Zener oscillations of atoms inside an optical cavity , B.. Prasanna Venkatesh, M.. Hinds, D.. O'Dell, ArXiv:0811.. 3993.. To appear in Phys.. A.. Atom chip for BEC interferometry , R.. Sewell, J.. Dingjan, F.. Baumgartner, I.. Llorente-Garcia, S.. Eriksson, E.. Hinds, G.. Lewis, P.. Srinivasan, Z.. O.. Gollash, M.. Kraft, ArXiv:0910.. 4547.. Submitted.. http://arxiv.. org/abs/0910.. 4547.. In preparation (submission expected before 4/12/09) , M.. Kohnen, M.. Hinds, ArXiv: 0912.. XXXX.. TH Peter Knight, Almut Beige (London).. Dynamics of thermal Casimir-Polder forces on polar molecules , S.. Ellingsen, S.. Y.. Buhmann, and S.. Scheel, Phys.. A 79, 052903 (2009).. Enhancement of thermal Casimir-Polder potentials of ground-state polar molecules in a planar cavity , S.. A 79, 022910 (2009).. van der Waals potentials of paramagnetic atoms , H.. Safari, D.. -G.. Welsch, S.. A 78, 062901 (2008).. Macroscopic quantum electrodynamics and duality , S.. Buhmann and S.. 102, 140404 (2009).. Casimir forces in multi-sphere configurations , J.. R.. Babington and S.. Scheel, arXiv:0909.. 3285, submitted for publication in Phys.. E.. Casimir-Polder forces on moving atoms , S.. Scheel and S.. Buhmann, Phys.. A 80, 042902 (2009).. Quantum computation via measurements on the low-temperature state of a many-body system , D.. Jennings, A.. Dragan, S,D.. Barrett, S.. D.. Bartlett, and T.. Rudolph, Phys.. A 80, 032328 (2009).. Cooling atoms into entangled states , G.. Vacanti and A.. Beige, New J.. 11, 083008 (2009).. 4 OEAW IBK.. EX Rainer Blatt (Innsbruck).. Articles.. Absolute frequency measurement of the 40Ca+ 4s 2S1/2 - 3d 2D5/2 clock transition , M.. Chwalla, J.. Benhelm, K.. Kim, G.. Kirchmair, T.. Monz, M.. Riebe, P.. Schindler, A.. Villar, W.. Hänsel, C.. Roos, R.. Blatt, M.. Abgrall, G.. Santarelli, G.. D.. Rovera, P.. Laurent, Phys.. 102, (2009).. Deterministic single-photon source from a single ion , H.. Barros, A.. Stute, T.. Northup, C.. Russo, P.. Schmidt, R.. Blatt, New J.. 11, (2009).. Deterministic reordering of 40Ca+ ions in a linear segmented Paul trap , F.. Splatt, M.. Harlander, M.. Brownnutt, F.. Zähringer, R.. Blatt, W.. Hänsel, New.. Spectroscopy of a single ion coupled to a high-finesse cavity , C.. Russo, H.. Stute, F.. Dubin, E.. S.. Philips, T.. Monz, T.. Becher, T.. Salzburger, H.. Ritsch, P.. Blatt, RamanAppl.. B 95, (2009).. Realization of universal ion-trap quantum computation with decoherence-free qubits , T.. Monz, K.. Kim, A.. Villar, P.. Schindler, M.. Chwalla, M.. Riebe, C.. F.. Roos, H.. Häffner, W.. Hänsel, M.. Hennrich, R.. Blatt, Phys.. 103, 200503 (2009).. State-independent experimental test of quantum contextuality , G.. Kirchmair, F.. Gerritsma, M.. Kleinmann, O.. Gühne, A.. Cabello, R.. Blatt, C.. Roos, Nature 460, 494 (2009).. Quantum interference from remotely trapped ions , S.. Gerber, D.. Rotter, M.. Blatt, F.. Rohde, C.. Schuck, M.. Almendros, R.. Gehr, F.. Dubin, J.. Eschner, New J.. High-fidelity entanglement of 43Ca+ hyperfine clock states , G.. Kirchmair, J.. Benhelm, F.. Gerritsma, C.. A 79, (2009).. Deterministic entanglement of ions in thermal states of motion , G.. Realization of the quantum Toffoli gate with trapped ions , T.. Kim, W.. Riebe, A.. 102, (2009).. Proceedings.. Absolute frequency measurement of the 40Ca+ S1/2-D5/2 clock transition , M.. Santarelli, D.. Laurent, Proceedings of the 7th symposium on frequency standards and metrology ,(Pacific Grove, 2008-10-05) , 100 (2009).. T1 Hans Briegel (Innsbruck).. Quantum control and entanglement in a chemical compass , J.. Cai, G.. Guerreschi, H.. Briegel, arXiv:0906.. 2383.. Concatenated tensor network states , R.. Hübener, V.. Nebendahl, W.. Dür, arXiv:0904.. 1925.. Universal resources for approximate and stochastic measurement-based quantum computation , C.. -E.. Mora, M.. Piani, A.. Miyake, M.. Van den Nest, W.. Dür, H.. Briegel, arxiv:0904.. 3641.. Experimental Realization of a Controlled-NOT Gate with Four-Photon Six-Qubit Cluster States , W.. -B.. Gao, P.. Xu, X.. Yao, O.. Cabello, C.. -Y.. Lu, C.. -Z.. Peng, T.. Yang, Z.. Chen, J.. Pan, arxiv:0905.. 2103.. Experimental Test of Bell inequalities with Six-Qubit Graph States , W.. Gao, X.. Yao, P.. Xu, O.. Lu, T.. Pan, arxiv:0906.. 3390.. Generalized Concatenated Quantum Codes , M.. Grassl, P.. Shor, G.. Smith, J.. Smolin, B.. Zeng, arxiv:0901.. 1319.. Separability criteria for genuine multiparticle entanglement , O.. Gühne, M.. Seevinck, arxiv:0905.. 1349.. Entanglement verification with realistic measurement devices via squashing operations , T.. Moroder, O.. Gühne, N.. Beaudry, M.. Piani, N.. Lütkenhaus, arxiv:0909.. 4212.. Separability criteria and entanglement witnesses for symmetric quantum states , G.. Toth, O.. Gühne, arxiv:0908.. 3679.. Local unitary equivalence of multipartite pure states , B.. Kraus, arXiv:0909.. 5152.. Local renormalization method for random systems , O.. Gittsovich, R.. Hübener, E.. Rico Ortega, H.. Briegel, arXiv:0908.. 1312.. Matchgate and space-bounded quantum computations are equivalent , R.. Jozsa, B.. Kraus, A.. Miyake, J.. Watrous, arXiv:0908.. 1467.. Renormalization algorithm with graph enhancement , R.. Hübener, C.. Kruszynska, L.. Hartmann, W.. Dür, F.. Eisert, M.. Plenio, Phys.. A 79, 022317 (2009).. Measurement-based quantum computation , H.. Briegel, D.. Browne, W.. Dür, R.. Raussendorf, M.. Van den Nest, Nature Physics 5 1, 19-26 (2009).. Modeling the decay of entanglement for electron spin qubits in quantum dots , F.. Bodoky, O.. Blaauboer, J.. : Condens.. Matter 21, 395602 (2009).. Dür, M.. Van den Nest, A.. Briegel, Phys.. 103, 050503 (2009).. Unifying all classical spin models in a Lattice Gauge Theory , G.. De las Cuevas, W.. Briegel, M.. Martin-Delgado, Physical Review Letters 102, 230502 (2009).. Completeness of classical spin models and universal quantum computation , G.. Van den Nest, H.. Briegel, J.. Stat.. Mech.. , P07001 (2009).. Entanglement detection , O.. Gühne, G.. Toth, Physics Reports 474, 1 (2009).. Geometric measure of entanglement for symmetric states , R.. Hübener, M.. Kleinmann, T.. Wei, C.. González-Guillén, O.. Gühne, Phys.. A 80, 032324 (2009).. Demonstrating Anyonic Fractional Statistics with a Six-Qubit Quantum Simulator , C.. Lu, W.. Gao, O.. Gühne, X.. -Q.. Zhou, Z.. Pan, Phys.. 102, 030502 (2009).. Entanglement and permutational symmetry , G.. 102, 170503 (2009).. Spin squeezing and entanglement , G.. Toth, C.. Knapp, O.. Gühne, H.. A 79, 042334 (2009).. Valence Bond States: Link models , E.. Rico Ortega, R.. Hübener, S.. Montangero, N.. Moran, B.. Pirvu, J.. Vala, H.. Briegel, Annals of Physics 324, 1875 (2009).. Classical spin systems and the quantum stabilizer formalism: general mappings and applications , R.. van den Nest, W.. Math.. 50, 083303 (2009).. T2 Peter Zoller (Innsbruck).. An eta-condensate of fermionic atom paris via adiabatic state preparation , A.. Kantian, A.. Daley, and P.. Zoller, arXiv:0911.. 2005.. Observability of Quantum Criticality and a Continuous Supersolid in Atomic Gases , S.. Diehl, M.. Baranov, A.. Zoller, arXiv:0910.. 1859.. 5 ICFO ICFO.. EX Jürgen Eschner (Barcelona).. - Published.. Bandwidth-tunable single-photon source in an ion-trap quantum network , M.. Almendros, J.. Huwer, N.. Piro, F.. Hennrich, F.. Eschner, Phys.. 103.. , 213601 (2009).. An entangled photon source for resonant single-photon single-atom interaction , N.. Piro, A.. Haase, M.. Mitchell, J.. Eschner, J.. B: At.. Mol.. Opt.. 42.. , 114002 (2009).. Intensity-field correlation of single-atom resonance fluorescence , S.. Rotter, L.. Slodička, J.. Eschner, H.. Carmichael, R.. 102.. , 183601 (2009).. Tunable narrowband entangled photon pair source for resonant single-photon single-atom interaction , A.. Haase, N.. Piro, J.. Eschner, M.. Mitchell, Opt.. 34.. , 55-57 (2009).. Highlighted in Virtual Journal of Quantum Information.. , 013032 (2009).. - Accepted.. Resonant interaction of a single atom with single photons from a down-conversion source , C.. Schuck, F.. Rohde, N.. Piro, M.. Huwer, M.. Mitchell, M.. Hennrich, A.. Haase, F.. A, Rapid Comm.. ; arXiv:0906.. 1719.. - Submitted.. Polarization-correlated photon pairs from a single ion , F.. Rohde, J.. Almendros, C.. Eschner, arXiv:0911.. 4846.. Two-color photoionization of calcium using SHG and LED light , C.. Rohde, M.. Almendros, M.. Hennrich, J.. 3867.. A diode laser stabilization scheme for 40Ca+ single ion spectroscopy , F.. Schuck, J.. Eschner, arXiv:0910.. 1052.. TH Maciej Lewenstein (Barcelona).. Papers Reported in 2008.. W-like bound entangled states and secure key distillation , R.. Augusiak, P.. Horodecki,.. Europhys.. 85, 50001 (2009).. reference added.. Multipartite secret key distillation and bound entanglement , R.. A 80, 042307 (2009).. Enhancement of entanglement percolation in quantum networks via lattice transformations ,.. Lapeyre, J.. Wehr, M.. Lewenstein, Phys.. A 79, 04232 (2009).. reference added.. Disorder-induced phase control in superfluid Fermi-Bose mixtures , A.. Niederberger, J.. Wehr,.. Lewenstein, K.. Sacha, Europhys.. 86, 26004 (2009).. Positive maps, majorization, entropic inequalities and detection of entanglement ,.. R.. Augusiak, J.. Stasi ska, New J.. 11, 053018 (2009).. Entanglement and quantum groups , J.. Korbicz, J.. Lewenstein,.. 50, 062104 (2009).. Entanglement enhances security in quantum communication , R.. Demkowicz-Dobrza ski, A.. Sen(De), U.. Sen, M.. A 80, 012311 (2009).. Tóth, C.. Gühne, and H.. Briegel.. Fermion and spin counting in strongly correlated systems , S.. Braungardt, A.. Sen(De), U.. Sen,.. Glauber, and M.. A 78, 063613 (2008).. Structural approximations to positive maps and entanglement breaking channels , J.. Korbicz, M.. Almeida, J.. Bae, M.. Acín, Phys.. A 78, 062105 (2008).. Published/accepted in 2009.. Ultracold atomic gases in non-Abelian gauge potentials: The case of constant Wilson loop , N.. Goldman, A.. Kubasiak, P.. Gaspard, M.. A 79, 023624 (2009).. Quantum polarization spectroscopy of correlations in attractive fermionic gases , T.. Roscilde, M.. Rodríguez, K.. Eckert, O.. Lewenstein, E.. Polzik, A.. Sanpera, New J.. 11, 055041 (2009).. Dilute gas of ultracold two-level atoms inside a cavity: generalized Dicke Model, J.. Larson, M.. Lewenstein, New J.. 11, 063027 (2009).. Non-Abelian optical lattices: Anomalous quantum Hall effect and Dirac Fermions , N.. Kubasiak, A.. Bermudez, P.. Lewenstein, M.. Martin-Delgado, Phys.. 103, 035301 (2009).. Vortex nucleation as a case study of symmetry breaking in quantum systems, D.. Barberán, M.. Dalibard, Nature Phys.. 5, 431 437 (2009).. Pair-supersolid phase in a bilayer system of dipolar lattice bosons , C.. Trefzger, C.. Menotti, M.. 103, 035304 (2009).. Towards measurable bounds on entanglement measure , R.. Augusiak, M.. Lewenstein, Quantum Inf.. Process.. 8, 493 521 (2009).. Vortex nucleation in mesoscopic Bose superfluid and breaking of the parity symmetry , D.. A 80, 053611 (2009).. Area law for the entropy of low-energy states , Ll.. Masanes, Phys.. A 80, 052104 (2009).. The physics of dipolar bosonic quantum gases , Th.. Lahaye, C.. Menotti, L.. Santos, M.. Lewenstein, T.. Pfau, Rep.. Prog.. 72, 126401 (2009).. Entanglement and Permutational Symmetry , G.. Tóth, O.. Searching for extremal PPT entangled states , R Augusiak, J.. Grabowski, M.. Ku , M.. Lewenstein, accepted for publication in Optics Communications (arXiv:0907.. 4979).. Submitted papers:.. Quantum complex networks , S.. 3283.. Dark solitons near the Mott-insulator--superfluid phase transition , K.. Krutitsky, J.. Larson,.. Lewenstein, arXiv:0907.. 0625.. Creating p-wave superfluids and topological excitations in optical lattices , P.. Massignan,.. Sanpera, M.. Lewenstein, arXiv:0908.. 4568.. Topological phase transitions in the non-Abelian honeycomb lattice , A.. Bermudez, N.. Goldman,.. Kubasiak, M.. Martin-Delgado, arXiv:0909.. 5161.. Multipartite entanglement percolation , S.. Perseguers, D.. Cavalcanti, G.. Lapeyre Jr, M.. Acín, arXiv:0910.. 2438.. Quantum kinetic Ising models , R.. Augusiak, F.. Cucchietti, F.. Haake, M.. Lewenstein, arXiv:0911.. 0624.. Perfect Quantum Privacy Implies Nonlocality , R.. Augusiak, D.. Prettico, A.. Acín, arXiv:0911.. 3274.. Disordered quantum gases under control , L.. Sanchez-Palencia, M.. 0629.. Generation of macroscopic singlet states in atomic ensembles , G.. Tóth, M.. Mitchell, arXiv:0901.. 4110.. Unified framework for correlations in terms of local quantum observables , A.. Acin, R.. Cavalcanti, C.. Hadley, J.. Lewenstein, Ll.. Masanes, arXiv:0911.. 3606.. 6 TUD TUD Gerhard Birkl (Darmstadt).. Coherent Patterning of Matter Waves with Subwavelength Localization , J.. Mompart, V.. Ahufinger, G.. Birkl, Phys.. A, 79, 053638 (2009).. Manipulating mesoscopic multipartite entanglement with atom-light interfaces , J.. Stasi ska, C.. Rodó, S.. Paganelli, G.. Birkl, A.. Sanpera, accepted for publication, arXiv:0907.. 4261 (2009).. Parallelized Detection of Single Atoms in Arrays of Dipole Traps , J.. Kruse, M.. Schlosser, C.. Ewen, G.. Birkl, submitted for publication (2009).. Site-selective coherent manipulations of atomic quantum systems in two-dimensional arrays of dipole traps , J.. Gierl, G.. Magic-Wavelength-like behavior of alkali atoms in dipole potentials , J.. Kohärente Manipulation von Atomen in zweidimensionalen Dipolfallenregistern für die Quanteninformationsverarbeitung , Jens Kruse, Ph.. thesis, Technische Universität Darmstadt, Januar 2009.. 7 HHUD UDUS Dagmar Bruss (Düsseldorf).. Experimental detection of pseudo bond entanglement , H.. Kampermann, X.. Peng, D.. Bruß, and D.. Suter, arXiv:0909.. 2743, submitted to Phys.. Multipartite entanglement detection via structure factors , P.. Krammer, H.. Kampermann, D.. Bruß, R.. Bertlmann, L.. Kwek, and C.. Macchiavello, Phys.. 103, 100502 (2009).. On Global Effects Caused by Locally Noneffective Unitary Operations , S.. Gharibian, H.. Kampermann, and D.. Bruß,QIC 9, 1013 (2009).. Book contributions:.. Revealing Quantum Entanglement via Locally Noneffective Operations , D.. Bruß, S.. Gharibian, and H.. Kampermann, in Quantum Interaction, P.. Bruza, D, Sofge, W.. Lawless, K.. v.. Rijsbergen, and M.. Klusch (Eds.. ), Springer-Verlag Berlin Heidelberg (2009).. Creation and Detection of Entanglement, and Entanglement Purification and Distillation , D.. Bruß, in Compendium of Quantum Physics: Concepts, Experiments, History and Philosophy, D.. Greenberger, K.. Hentschel, and F.. Weinert (Eds.. 8 JoGuMainz UMAINZ Immanuel Bloch (Mainz).. Role of interactions in 87Rb-40K Bose-Fermi mixtures in a 3d optical lattice , Th.. Best, S.. Will, U.. Schneider, L.. Hackermüller, D.. van Oosten I.. Bloch, Phys.. 102, 030408 (2009).. Suppression of the critical temperature for superfluidity near the Mott transition: validating a quantum simulatorS , Trotzky, L.. Pollet, F.. Gerbier, U.. Schnorrberger, I.. Bloch, N.. Prokov ev, B.. Svistunov M.. Troyer, (submitted, arXiv:0905.. 4882).. Electromagnetic induced transparency and light storage in a Mott insulatorU.. Schnorrberger , J.. Thompson, S.. Trotzky, R.. Pugatch, N.. Davidson, S.. Kuhr I.. 103, 033003 (2009).. Anomalous size expansion of increasingly attractive fermionic atoms in an optical lattice , L.. Hackermüller, U.. Schneider, M.. Moreno, S.. Will, T.. Best, T.. Kitagawa, E.. Demler, I.. Bloch B.. Paredes, (submitted, arXiv:0910.. 3598).. Multiorbital Quantum Phase Diffusion S.. Best, U.. Lühmann I.. Bloch, (submitted, arXiv:0911.. 5066).. 9 UNIBONN UBONN Dieter Meschede, Arno Rauschenbeutel (Bonn).. Microwave ground state cooling and coherent motional dynamics of single neutral atoms , L.. Förster, , M.. Karski, J.. -M.. Choi, A.. Steffen, W.. Alt, D.. Meschede, A.. Widera, E.. Montano, J.. Lee, W.. Rakreungdet, and P.. S.. Jessen, Phys.. 103, 233001, (2009).. Quantum jumps and conditional spin dynamics in a strongly coupled atom-cavity system , M.. Khudaverdyan, W.. Alt, T.. Kampschulte, S.. Reick, A.. Thobe, A.. Widera, and D.. Meschede; Phys.. , 103, 123006 (2009).. Quantum Walk in Real Space with Single Optically Trapped Atoms , M.. Karski, L.. Förster, J.. Widera, Science 325 (5937), 174 (2009).. High-resolution Preparation and Manipulation of Neutral Atoms in a 1D optical Lattice using Magnetic Resonance Techniques , M.. Widera, New J.. , submitted (2009).. Spin dynamics of one and two atoms strongly coupled to an optical cavity , S.. Thobe, T.. Kampschulte, L.. Kong, W.. Alt, A.. Widera, D.. Meschede, K.. Moelmer, J.. Soc.. Am.. B, to be submitted.. 11 UOXF UOXF Andrew Steane, David Lucas (Oxford).. Memory coherence of a sympathetically cooled trapped-ion qubit , J.. Home, M.. McDonnell, D.. Szwer, B.. Keitch, D.. Lucas, D.. N.. Stacey, A.. Steane Physical Review A Vol.. 79 No.. 5 Art.. No.. 050305 (2009).. Implementation of a symmetric surface electrode ion trap with field compensation using a modulated Raman effect D.. T.. Allcock, J.. Sherman, D.. Burrell, M.. Curtis, G.. Imreh, N.. Linke, D.. Szwer, S.. Webster, A.. Steane, D.. Lucas [preprint] arXiv:0909.. 3272v2 [quant-ph] (2009).. Scalable simultaneous multi-qubit readout with 99.. 99% single-shot fidelity , A.. Burrell, D.. Webster, D.. Lucas [preprint] arXiv:0906.. 3304v1 [quant-ph] (2009).. High Fidelity Readout and Protection of a 43Ca+ Trapped Ion Qubit , D.. Phil.. dissertation, David Szwer Oxford 2009.. 11 UOXF UOXF2 Axel Kuhn (Oxford).. Coherent imaging of extended objects, Opt.. Comm.. Brainis, C.. Muldoon, L.. Brandt, and A.. Kuhn: 282, 465 472 (2009), arXiv:0807.. 1718v1.. Optimum pulse shapes for stimulated Raman adiabatic passage , G.. Vasilev, A.. Kuhn, and N.. Vitanov: Phys.. A 80, 013417 (2009), arXiv:0906.. 1989v1.. Single photons made-to-measure, submitted , G.. Vasilev, D.. Ljunggren, and A.. Kuhn: arXiv:0907.. 0761v1.. Cavity-based single-photon sources , A.. Kuhn and D.. Ljunggren: Contemporary Physics (submitted).. 12 UCAM-DAMPT CAMBRIDGE Artur Ekert, Matthias Christiandl (Cambridge).. Strong nonlocality: A trade-off between states and measurements , A.. Short and J.. Barrett, arXiv:0909.. 2601 [quant-ph] (2009).. No Deterministic Purification for Two Copies of a Noisy Entangled State , A.. Short, Phys.. 102, 180502 (2009).. Is Teleportation a (quantum) mystery , B.. Groisman, arXiv:0806.. 1679 [quant-ph] (2009).. Quantum mutual independence , M.. Horodecki, J.. Oppenheim, A.. Winter, arXiv:0902.. 0912 [quant-ph].. New bounds on entanglement resources for instantaneous measurement of multipartite nonlocal variables , B.. Groisman, [in preparation].. Optimal Cloning and Singlet Monogamy , A.. Kay, D.. Kaszlikowski, and R.. Ramanathan, Phys.. 103, 050501 (2009).. Computation on Spin Chains with Limited Access , A.. Kay, P.. Pemberton-Ross, arXiv:0905.. 4070 [quant-ph], to appear in Phys.. A (2009).. Limitations of Passive Protection of Quantum Information , F.. Cirac, arXiv:0911.. 3843v1 [quant-ph] (2009).. Robust Entanglement in Anti-ferromagnetic Heisenberg Chains by Single-spin Optimal Control ,.. X.. Wang, A.. Bayat, S.. Schirmer, S.. Bose, arXiv: 0911.. 5405 [quant-ph] (2009).. Implementation of Fault-tolerant Quantum Logic Gates via Optimal Control R.. Nigmatullin , S.. Schirmer, arXiv:0907.. 1635 [quant-ph].. 13 AAR UAARHUS Klaus Mølmer (Aarhus).. (Unfortunately, the article 5 was published without any of the acknowledgments put originally in the manuscript).. Dynamical programming of continuously observed quantum systems , Viacheslav P.. Belavkin, Antonio Negretti, Klaus Mølmer,; Phys.. A,.. 79.. , 022123 (2009).. Atomic quantum superposition state generation via optical probing , Anne E.. Nielsen, Uffe V.. Poulsen, Antonio Negretti, Klaus Mølmer, Phys.. , 023841 (2009).. Few qubit atom-light interfaces with collective encoding , Line Hjortshøj Pedersen and Klaus Mølmer, Phys.. , 012320 (2009).. Quantum computing with an electron spin ensemble , J.. Wesenberg, A.. Ardavan, G.. Briggs, J.. Morton, R.. Schoelkopf, D.. Schuster, K.. Mølmer, Phys.. , 070502 (2009).. Quantum learning by measurement and feedback , Søren Gammelmark, Klaus Mølmer, New J.. 033017 (2009); arXiv.. org/abs/0803.. 1418.. Efficient multiparticle entanglement via asymmetric Rydberg blockade , Mark Saffman and Klaus Mølmer, Phys.. , 240502 (2009); arXiv:0812.. 2425.. Submitted:.. Quantum information with Rydberg atoms , M.. Saffman, T.. Walker, K.. Mølmer, submitted to Rev.. Mod.. , September 2009; arXiv:0909.. 4777.. Storage of multiple coherent microwave excitations in an electron spin ensemble , Hua Wu, Richard E.. George, Arzhang Ardavan, Janus H.. Wesenberg, Klaus Mølmer, David I.. Schuster, Robert J.. Schoelkopf, Kohei M.. Itoh, John J.. Morton, G.. Andrew D.. Briggs, submitted for publication; arXiv:0908.. 0101.. 14 UNICAM UNICAM Paolo Tombesi, David Vitali (Camerino).. Maximal entanglement achievable by controlled dynamics , A.. Serafini and S.. Mancini,.. arXiv:0910.. 2205 (Submitted to Phys.. Entanglement generation and perfect state transfer in ferromagnetic qubit chains , G.. Gualdi, I.. Marzoli, and P.. Tombesi, , New J.. 11, 063038 (2009).. Spin chains as quantum channels for qubit state transfer , G.. Tombesi, , in IARIA ICQNM 2009 Proceedings (2009).. Three-qubit quantum error correction code on Rydberg atoms qubits, C.. Ottaviani and D.. Vitali, in preparation.. Quantum reservoir engineering on photons , S.. Pielawa, G.. Morigi, D.. Vitali, and L.. Davidovich, in preparation.. 15 WEIZMANN WEIZMANN Gershon Kurizki (Rehovot).. Unitary and Non-Unitary Manipulations of Qubit-Bath Entanglement: non-Markov Qubit Cooling Quantum Information Processing 8, 607 (2009) (Invited).. Reversible state transfer between superconducting qubits and atomic ensembles Physical Review A, Vol.. 79, No.. (2009), 040304.. Master Equation and Control of an Open Quantum System with Leakage Phys.. 102, 080405 (2009).. Non-Markovian control of qubit thermodynamics by frequent quantum measurements Physica E (in press doi:10.. 1016/j.. physe.. 2009.. 06.. 029).. Geometry-dependent interplay of long-range and short-range interactions in ultracold fermionic gases New J.. 10, 045013 (2008).. Creation of macroscopic quantum superposition states by a measurement Europhys.. 83 60004 (2008).. Short-time Enhancement of the Decay of Coherent Excitations in Bose-Einstein Condensates PRL 102, 110401 (2009).. Decoherence control in Bosonic Josephson Junctions Phys.. A (in press).. Decoherence and entanglement in a bosonic Josephson junction: Bose-enhanced quantum Zeno control of phase diffusion Phys.. A 80, 023609 (2009).. 16 GUT GUT Pawel Horodecki (Gdansk).. Broadcast Copies Reveal the Quantumness of Correlations , M.. Piani, M.. Christandl, C.. , Mora, P.. Horodecki, Physical Review Letters 102, 250503 (2009).. When non i.. i.. d.. information sources can be communicationally useful? M.. Paw owski, K.. Horodecki, P.. Horodecki, R.. Horodecki arXiv:0902.. 2162 (2009).. Quantum superadditivity in linear optics networks: sending bits via multiple access Gaussian channels ,.. Czekaj, J.. Korbicz, R.. Chhajlany, P.. Horodecki, arXiv:0904.. 4870 (2009).. Nonadditivity of quantum and classical capacities for quantum networks with entanglement breaking lines, A.. Grudka, P.. Horodecki, arXiv:0906.. 1305 (2009).. Preselected macro-macro entanglement: loophole-free Bell inequality test ? , M.. Stobi ska, P.. Chhajlany, R.. Horodecki, arXiv:0909.. 1545 (2009).. Papers reported in previous SCALA research years as preprints, published in Y4:.. Purely Quantum Superadditivity of Classical Capacities of Quantum Multiple Access Channels , ukasz Czekaj, Pawe Horodecki, Physical Review Letters 102, 110505 (2009).. A simple test for quantum channel capacity , Marcin.. Nowakowski, Pawel Horodecki, Journal of Physics A, 42, 1 (2009).. Quantum entanglement , Ryszard Horodecki, Pawe Horodecki, Micha Horodecki, Karol Horodecki, Reviews of Modern Physics 81, 865 (2009).. Multipartite secret key distillation and bound entanglement , Remigiusz Augusiak, Pawe Horodecki, Physical Review A 80, 042307 (2009).. Inseparability criteria based on matrices of moments , Adam Miranowicz, Marco Piani, Pawe Horodecki, Ryszard Horodecki, Physical Review A 80, 052303 (2009).. W-like bound entangled states and secure key distillation , Remigiusz Augusiak, Pawe Horodecki, Europhysics Letters, 85, 50001, (2009).. 17 GDA UG Ryszard Horodecki (Gdansk).. Winter arXiv:0902.. 0912.. information sources can be communicationally useful? , M.. 2162.. Constructive counterexamples to additivity of minimum output Rényi entropy of quantum channels for all $p 2$ , A.. Grudka, M.. Pankowski arXiv:0911.. 2515.. On Hastings' counterexamples to the minimum output entropy additivity conjecture , Fernando G.. L.. Brandao, Michal Horodecki arXiv:0907.. 3210.. Protected Subspaces in Quantum Information , K.. Majgier, H.. Maassen, K.. yczkowski arXiv:0902.. 4126 , Quantum Information Processing, 2009, in press.. Product numerical range: a versatile tool in the theory of quantum information , P.. Gawron, Z.. Pucha a, J.. Miszczak,.. Skowronek, M.. -D.. Choi, K.. yczkowski arXiv: 0905.. 3646.. Masanes arXiv:0911.. 3606.. Horodecki arXiv:0904.. 4870.. Entanglement and communication-reducing properties of noisy N-qubit states , W.. Laskowski, T.. Paterek, C.. Brukner, M.. ukowski arXiv:0906.. 0860.. Interference contrast in multi-source few photon optics , W.. Laskowski, M.. Wie niak, M.. ukowski, M.. Bourennane, H.. Weinfurter J.. B 42, 114004 (2009).. Searching for extremal PPT entangled states , R.. Lewenstein arXiv:0907.. 4979, accepted for publication in Opt.. 18 NPL ML NPL Patrick Gill (Teddington).. 22 TUW TUW Jörg Schmiedmayer (Heidelberg).. Books:.. Materiewellen auf dem Chip , T.. Schumm and J.. Schmiedmayer, Physik Journal 8, 23 (2009).. Fermions on atom chips , M.. Extravour, L.. LeBlanc, J.. McKeever, A.. Bardon, S.. Aubin, S.. Myrskog, T.. Schumm, and J.. Thywissen, (invited book contribution to Atom Chips , editors J.. Vuletic, Wiley-VCH Verlag GmbH, Weinheim, in production, arXiv:0811.. 1401).. Interferometry with Bose-Einstein condensates , T.. Schumm, S.. Manz, R.. Bücker, D.. Smith, and J.. Schmiedmayer (invited book contribution to Atom Chips , editors J.. Vuletic, Wiley-VCH Verlag GmbH, Weinheim, in production).. Papers:.. Atom Interferometers , Alexander D.. Cronin, Jörg Schmiedmayer, David E.. Pritchard, Rev.. 81, 1051 (2009);.. Simple integrated single-atom detector , M.. Wilzbach, D.. Heine, S.. Groth, X.. Liu, T.. Raub, B.. Hessmo, J.. Schmiedmayer, Optics Letters 34, 259 (2009),.. Optimizing number squeezing when splitting a mesoscopic condensate , J.. Grond, J.. Schmiedmayer, U.. Hohenester, Phys.. A 79, 021603(R) (2009).. A millisecond quantum memory for scalable quantum networks , B.. Zhao, Y.. -A.. Chen, X.. -H.. Bao, T.. Strassel, C.. -S.. Chuu, X.. Jin, J.. Schmiedmayer, Z.. Yuan, S.. Pan, Nature Physics 5, 95 (2009).. Strong magnetic coupling of an ultracold gas to a superconducting waveguide cavity , J.. Verdu, H.. Zoubi, Ch.. Koller, J.. Majer, H.. Ritsch, J.. Schmiedmayer, Phys.. 103, 043603 (2009).. Integrated atom detector: Single atoms and photon statistics , D.. Heine, M.. Wilzbach, T.. A 79, 021804(R) (2009).. Reversible state transfer between superconducting qubits and atomic ensembles , D.. Petrosyan, G.. Bensky, G.. Kurizki, I.. Mazets, J.. Majer, J.. Schmiedmayer, PRA, 79, 040304 (2009).. Single-particle-sensitive imaging of freely propagating ultracold atoms , R.. Bücker, A.. Perrin, S.. Manz, T.. Betz, Ch.. Koller, T.. Plisson, J.. Rottmann, T.. Schumm, J.. Schmiedmayer, New J.. 11 No 10 (October 2009) 103039;.. Density Ripples in expanding low-dimensional gases as a probe of correlations , A.. Imambekov, I.. Mazets, D.. Petrov, V.. Gritsev, S.. Manz,S.. Hofferberth, T.. Schumm, E.. Demler, and J.. A 80, 033604 (2009).. Quantum noise thermometry for bosonic Josephson junctions in the mean-field regime , A.. Gottlieb and T.. Schumm, Phys.. A 79, 063601 (2009).. Stability of a superconductive atom chip with persistent current , Ch.. Hufnagel, T.. Mukai and F.. Shimizu, Phys.. A 79, 053641 (2009).. An optical lattice on an atom chip , D.. Gallego, S.. Schumm, P.. Krüger, J.. Schmiedmayer, Optics Letters, 34, 22, 3463 (2009).. Restoring integrability in one-dimensional quantum gases by two-particle correlations , I.. Mazets and J.. Schmiedmayer, PRA 79, 061603 (2009).. Ramsey's Method of Separated Oscillating Fields and its Application to Gravitationally Induced Quantum Phaseshifts H.. Abele, T.. Jenke, H.. Leeb, J.. Schmiedmayer, arXiv:0907.. 5447.. Two-point density correlations of quasi-condensates in free expansion , S.. Bücker, T.. Koller, S.. Hofferberth, I.. Mazets, A.. Imambekov, E.. Demler, A.. Perrin, J.. Schmiedmayer, and T.. Schumm, submitted to PRL.. Opposite sign correlations in fermion or boson gases , A.. Gottlieb, T.. Schumm, ArXiv:0705.. 3491 (submitted Physical Review A).. Quantum Computing , J.. Majer, Bulletin SEV 05, (2009).. Demonstration of two-qubit algorithms with a superconducting quantum processor , L.. DiCarlo, J.. Chow, J.. Gambetta, Lev S.. Bishop, B.. Johnson, D.. Schuster, J.. Majer, A.. Blais, L.. Frunzio, S.. Girvin, and R.. Schoelkopf, Nature 460, 240-244 (2009).. 23 UAB UAB Anna Sanpera (Barcelona).. Massignan, A.. Lewenstein arXiv:0908.. 4568v2 (preprint).. Manipulating mesoscopic multipartite entanglement with atom-light interfaces J.. Paganelli,G.. Birkl, and A.. Sanpera arXiv:0907.. 4261v1.. In print Phys.. Optimized electron propagation on a quantum chain by a topological phase S.. Giorgi and F.. de Pasquale, Fortschr.. 57, 1094 (2009).. Quantum polarization spectroscopy of correlations in attractive fermionic gases T.. Polzik  ...   Move around the clock ,.. Meschede, Nature Physics 3, 684 (2007).. Andrew Steane, David Lucas (Oxford).. How to build a 300 bit, 1 Giga-operation quantum computer,.. Steane, Quant.. Inf.. Comp.. 7, p.. 171-183 (2007).. A long-lived memory qubit on a low-decoherence quantum bus,.. Lucas, B.. Keitch, J.. Home, G.. Imreh, M.. Szwer, A.. Steane , Submitted for publication (arXiv:0710.. 4421).. Optical Bloch Equations with Multiply-Connected States.. Stacey, D.. Allcock, D.. Lucas, D.. Szwer, S.. Webster, submitted to J.. Artur Ekert, Matthias Christiandl (Cambridge).. Squashed entanglement for multipartite states and entanglement measures based on the mixed convex roof ,.. Dong Yang, Karol Horodecki, Michal Horodecki, Pawel Horodecki, Jonathan Oppenheim, Wei Song, arXiv:0704.. 2236.. Unconditional privacy over channels which cannot convey quantum information ,.. Karol Horodecki, Michal Horodecki, Pawel Horodecki, Debbie Leung, Jonathan Oppenheim, arXiv:quant-ph/0702077.. Quantum network communication -- the butterfly and beyond ,.. Debbie Leung, Jonathan Oppenheim, Andreas Winter, arXiv:quant-ph/0608223.. Quantum Cryptography with Finite Resources ,.. Valerio Scarani (Singapore), Renato Renner (Cambridge), arXiv:0708.. 0709.. Symmetry implies independence ,.. Renato Renner, Journal-ref: Nature Physics 3, 645 - 649 (2007), arXiv:quant-ph/0703069.. A most compendious and facile quantum de Finetti theorem ,.. Robert Koenig, Graeme Mitchison, arXiv:quant-ph/0703210.. Possibility, Impossibility and Cheat-Sensitivity of Quantum Bit String Commitment ,.. Harry Buhrman, Matthias Christandl, Patrick Hayden, Hoi-Kwong Lo, Stephanie Wehner, arXiv:quant-ph/0504078.. Entanglement Assisted Classical Capacity of a Class of Quantum Channels with Long-Term Memory.. ,.. Nilanjana Datta, Yurii Suhov, Tony C.. Dorlas, arXiv:0705.. 1465.. »Entanglement Cost for Sequences of Arbitrary Quantum States.. Garry Bowen, Nilanjana Datta, [arXiv:0704.. 1957v1],arXiv:0704.. 1957.. »Cloning and Broadcasting in Generic Probabilistic Theories ,.. Howard Barnum, Jonathan Barrett, Matthew Leifer, Alexander Wilce, arXiv:quant-ph/0611295.. »Asymptotic Entanglement Manipulation of Bipartite Pure States ,.. Garry Bowen and Nilanjana Datta, Journal-ref: accepted by IEEE Transactions on Information Theory, arXiv:quant-ph/0610199.. Implementing universal quantum gates in coupled cavities ,.. Dimitris G.. Angelakis, Alastair Kay,Journal-ref: Am.. Inst.. of Phys.. Vol.. 963, 763 (2007), arXiv:0707.. 3946.. Transfer of a Polaritonic Qubit through a Coupled Cavity Array ,.. Sougato Bose, Dimitris G.. Angelakis, Daniel Burgarth, Journal-ref: Journ.. of Mod.. 54, 2307 (2007), arXiv:0704.. 0984.. Cluster state quantum computation in coupled cavity arrays ,.. Angelakis, Alastair Kay, arXiv:quant-ph/0702133.. Photon blockade induced Mott transitions and XY spin models in coupled cavity arrays ,.. Angelakis, Marcelo F.. Santos, Sougato Bose, Journal-ref: Phys.. A (Rap.. Com.. ) 76, 031805 (2007), arXiv:quant-ph/0606159.. An N-Qubit Entanglement Witness Based on N-point Correlation Functions ,.. Dagomir Kaszlikowski, Alastair Kay, arXiv:0710.. 1928.. The Topological Properties of Fault-Tolerant Circuits ,.. Alastair Kay, arXiv:quant-ph/0702092.. The Impossibility of Quantum State Mirroring on Square Lattices ,.. Alastair Kay, arXiv:quant-ph/0702088.. »Robust state stansfer and rotation through a spin chain via dark passage ,.. Ohshima, Toshio, Ekert, Artur, Oi, Daniel K.. , Kaslizowski, Dagomir, Kwek, L.. , arXiv:quant-ph/0702019.. Steady state entanglement between distant hybrid light-matter qubits under classical driving ,.. Angelakis, Stefano Mancini, Sougato Bose, arXiv:0711.. 1830.. List of Publications (updated list from last year s report many references are now published).. One-and-a-half quantum de netti theorem , Comm.. Christandl, R.. König, G.. Mitchison, and R.. Renner, 273 (2), 473-498, 2007,.. arxiv.. org/abs/quant-ph/0602130.. The Bounded Storage Model in The Presence of a Quantum Adversary (2006) ,.. König and B.. Terhal, submitted to IEEE Transactions on Information Theory,.. http://arxiv.. org/abs/quant-ph/0608101.. Photon blockade induced mott transitions and xy spin models in coupled cavity arrays.. Angelakis, M.. Santos, and S.. Bose, Phys.. ) 76, 031805 (2007) http://www.. org/abs/quant-ph/0606159.. Generation and verification of high dimensional entanglement from coupled cavity arrays ,.. Angelakis and S.. Bose, to appear in Journal of the Optical Society of America B (2006).. Unifying Classical and Quantum Key Distillation ,.. Christandl, A.. Ekert, M.. Oppenheim, and R.. Renner, Proceedings of the 4th Theory of Cryptography Conference, Lecture Notes in Computer Science vol.. 4392, pp.. 456-478, 2007 http://www.. org/abs/quant-ph/0608199.. N-representability is QMA-complete ,.. -K.. Liu, M.. Christandl, and F.. Verstrate, Phys.. 98, 110503 (2007) http://www.. org/abs/quant-ph/0609125.. Security of quantum bit string commitment depends on the information measure ,.. Buhrman, M.. Christandl, P.. Hayden, H.. Lo, and S.. Wehner, Phys.. , 97, 250501 (2006), http://www.. org/abs/quant-ph/0609237.. Asymptotic Entanglement Manipulation of Bipartite Pure States (2006),.. Bowen and N.. Datta, submitted to IEEE Transactions on Information Theory, http://www.. org/abs/quant-ph/0610199.. Quantum Coding Theorems for Arbitrary Sources, Channels and Entanglement Resources (2006),.. org/abs/quant-ph/0610003.. Coding Theorem for a Class of Quantum Channels with Long-Term Memory (2006),.. Datta and T.. Dorlas, http://www.. org/abs/quant-ph/0610049.. On Nonzero Kronecker Coefficients and their Consequences for Spectra , Commun.. ,.. Harrow, and G.. Mitchison, 270, 575-585 (2007), http://www.. org/abs/quant-ph/0511029.. The Spectra of Density Operators and the Kronecker Coefficients of the Symmetric Group.. (2006),.. Christandl.. and G.. Mitchison, Comm.. , Vol.. 261, No.. 3, pp.. 789-797 (2006), http://www.. org/abs/quant-ph/0409016.. Optimality of purification protocols and upper-bounds to fault-tolerance ,.. Kay and J.. Pachos, Phys.. A 75, 062307 (2007), http://www.. org/abs/quant-ph/0608080.. Optimal purification of thermal graph states ,.. Kay, J.. Pachos,.. Dür and.. Briegel,.. 8 (2006) 147, http://www.. org/abs/quant-ph/0606177.. State transfer and Spin Measurement ,.. Kay, Phys.. 98, 010501 (2007) http://www.. org/abs/quant-ph/0604137.. Perfect State Transfer: Beyond Nearest-Neighbor Couplings ,.. Kay,Phys.. A 73, 032306 (2006), http://www.. org/abs/quant-ph/0509065.. Graph State Preparation and Cluster Computation with Global Addressing of Optical Lattices ,.. Pachos, and C.. Adams,Phys.. A 73, 022310 (2006), http://www.. org/abs/quant-ph/0501166.. Klaus Mølmer (Aarhus).. Quantum computing with a single molecular ensemble and a Cooper pair box ,.. Karl Tordrup and Klaus Mølmer: arXiv:0711.. 0606.. Geometric phase gates based on stimulated Raman adiabatic passage in tripod systems.. Ditte Møller, Lars Bojer Madsen, Klaus Mølmer: Physical Review A 75, 062302 (2007).. Geometric phases in open tripod systems ,.. Ditte Møller, Lars Bojer Madsen and Klaus Mølmer, submitted to Physical Review A, October 2007; arXiv:0710.. 0450.. Effects of ground-state hyperfine shifts in quantum computing with rare-earth-metal ions in solids ,.. Karl Tordrup and Klaus Mølmer: Phys.. A 75, 022316 (2007).. Universal Quantum Computation in a Neutral Atom Decoherence Free Subspace.. Brion, L.. Pedersen, K.. Mølmer, S.. Chutia, and M.. Saffman: Phys.. A 75, 032328 (2007).. Fidelity of quantum operations ,.. Line Hjortshøj Pedersen, Niels Martin Møller and Klaus Mølmer: Physics Letters A 270, 47 (2007).. Trapping of light pulses in ensembles of stationary Lambda atoms, Kristian Rymann Hansen, Klaus Mølmer: Phys.. A 75, 053802 (2007).. Single-photon-state generation from a continuous-wave nondegenerate optical parametric oscillator ,.. Anne E.. Nielsen and Klaus Mølmer: Phys.. A 75, 023806 (2007).. Conditional generation of path-entangled optical |N,0 + |0,N states ,.. Nielsen and Klaus Mølmer:.. A 75, 063803 (2007).. Quantum Light States Engineering via Quantum Feedback Control ,.. Antonio Negretti, Uffe V.. Poulsen, and Klaus Mølmer: To appear in Phys.. ; quant-ph/0703040.. Conditional dynamics induced by new configurations for Rydberg dipole-dipole interactions ,.. Brion, A.. Mouritzen and K.. Mølmer: Phys.. A 76, 022334 (2007).. Quantum computing with collective ensembles of multi-level systems ,.. Brion, K.. Mølmer, M.. Saffman: To appear in Physical Review Letters; quant-ph/0708.. 1386.. Error correction in ensemble registers for quantum repeaters and quantum computers ,.. Etienne Brion, Line Hjortshøj Pedersen, Mark Saffman, Klaus Mølmer:.. Submitted for publication; arXiv:0710.. 1717.. Paolo Tombesi, David Vitali (Camerino).. Generation of Einstein-Podolsky-Rosen-entangled radiation through an atomic reservoir ,.. Davidovich.. 98, 240401 (2007)).. Open-loop stochastic control of quantum coherence ,.. Kurizki, S.. Mancini, D.. Tombesi, J.. 40 (2007) S61-S73.. Minimal qudit code for a qubit in phase damping channel ,.. Braunstein, S.. Mancini and D.. Vitali, arXiv:0705.. 1099.. Optimal control of entanglement via quantum feedback ,.. Mancini, and H.. Wiseman, Phys.. A 75, 012330 (2007).. Additive quantum gaussian channels with memory ,.. Ruggeri and S.. Mancini, Quant.. Comp.. 7, 265 (2007).. Spin chains with electrons in Penning traps ,.. A 75, 032348 (2007).. A cavity-QED scheme for Heisenberg-limited interferometry ,.. Vitali, S.. Raimond, J.. 54, 1551-1567 (2007).. Gershon Kurizki (Rehovot).. Signatures of strong momentum localization via.. entanglement of translational and internal states ,.. Bar-Gil and G.. Kurizki, Phys.. 97, 230402 (2006).. Universal dynamical decoherence control of noisy single- and multi-qubit systems ,.. Goren Gordon, Noam Erez and Gershon Kurizki, J.. B 40, S75 (2007).. Open-loop stochastic control of quantum coherence , Goren Gordon, Gershon Kurizki, Stefano Mancini, David Vitali and Paolo Tombesi, J.. B 40, S61(2007).. Universal dynamical decoherence control of noisy single- and multi-qubit systems , Goren Gordon, Noam Erez and Gershon Kurizki, J.. Control of multiatom entanglement in a cavity ,.. Aikaterini Mandilara, Vladimir M.. Akulin,.. Michal Kolar and Gershon Kurizki, Phys.. A 75, 022327 (2007).. How to control decoherence and entanglement in quantum complex systems? ,.. V M Akulin, G Kurizki and D A Lidar, J.. B 40, Editorial (2007).. Universal dephasing control during quantum computation ,.. Goren Gordon and Gershon Kurizki, Phys.. A 76, 042310 (2007).. Path phase duality with intraparticle translational internal entanglement , Michal Kolá , Tomá Opatrný, Nir Bar-Gill, Noam Erez and Gershon Kurizki, New J.. 9 129 (2007).. Multiatom cooperative emission following single-photon absorption: Dicke-state dynamics , I E Mazets and G Kurizki, J.. B 40 F105 (2007).. Modification of Scattering Lengths via Magnetic Dipole-Dipole Interactions ,.. Mazets and G.. 98, 140401 (2007).. Pawel Horodecki (Gdansk).. Squashed entanglement for multipartite states and entanglement measures based on the mixed convex roof ,.. Unconditional privacy over channels which cannot convey quantum information.. Karol Horodecki, Michal Horodecki, Pawel Horodecki, Debbie Leung, Jonathan Oppenheim, arXiv: quant-ph/0702077.. Entanglement-swapping boxes and their communication properties.. Andrzej Grudka, Michal Horodecki, Pawel Horodecki, Ryszard Horodecki, Marco Piani, arXiv:quant-ph/0703095.. Separability in terms of a single entanglement witness.. Piotr Badziag, Pawel Horodecki, Ryszard Horodecki, Remigiusz Augusiak, arXiv:quant-ph/0703097.. Quantum entanglement.. Ryszard Horodecki, Pawel Horodecki, Michal Horodecki, Karol Horodecki, arXiv:quant-ph/0702225.. No-local-broadcasting theorem for quantum correlations.. Marco Piani, Pawel Horodecki, Ryszard Horodecki, arXiv:0707.. 0848, Phys.. (accepted).. Quantum key distribution based on private states: unconditional security over untrusted channels with zero quantum capacity.. Karol Horodecki, Michal Horodecki, Pawel Horodecki, Debbie Leung, Jonathan Oppenheim , arXiv:quant-ph/0608195, IEEE TIT (accepted).. Beyond the standard entropic inequalities: stronger scalar separability criteria and their applications ,.. Remigiusz Augusiak, Julia Stasinska, Pawel Horodecki, arXiv:0707.. 4315, Phys.. A (accepted).. A general scheme for construction of scalar separability criteria from positive maps.. Remigiusz Augusiak, Julia Stasinska, arXiv:0709.. 3779, Phys.. Ryszard Horodecki (Gdansk).. A statistical mechanics view on Kitaev's proposal for quantum memories.. Horodecki, arXiv:quant-ph/0702102, J.. 40, 6451-6467 (2007).. A decoupling approach to the quantum capacity.. Patrick Hayden, Michal Horodecki, Jon Yard, Andreas Winter, arXiv:quant-ph/0702005.. Quantum coding theorem from privacy and distinguishability.. Michal Horodecki, Seth Lloyd, Andreas Winter, arXiv:quant-ph/0702006.. Quantification of quantum correlation of ensembles of states ,.. Sen(De), and U.. Sen, Phys.. A 75, 062329 (2007).. Information gain and approximate reversibility of quantum measurements: an entropic approach.. Francesco Buscemi, Masahito Hayashi, Michal Horodecki, arXiv:quant-ph/0702166.. Composition of quantum states and dynamical subadditivity.. Zyczkowski, arXiv:quant-ph/0706.. 2791.. Remarks on the equivalence of full additivity and monotonicity for the entanglement cost.. Brandao, M.. Horodecki, M.. Plenio, S.. Virmani, Open Sys.. Dyn.. , 14, page 333 (2007).. Squashed entanglement for multipartite states and entanglement measures based on the mixed convex roof.. Constraints on many-to-one multipartite dense coding.. Piani, arXiv:quant-ph/0701134.. Conditional Entanglement.. Dong Yang, Michal Horodecki, Z.. Wang, arXiv:quant-ph/0701149.. Jan Samsonowicz, Marek Kus, Maciej Lewenstein, Phys.. A 76, 022314 (2007).. On the relation between states and maps in infinite dimensions.. Janusz Grabowski, Marek Kus, Giuseppe Marmo, Open Sys.. Information Dyn.. 14, 1 (2007).. On positive decomposable maps.. Majewski, Rep.. Physics 59, 289 (2007).. On the structure of positive maps between matrix algebras.. Majewski, M.. Marciniak, h.. FA/0705.. 0798.. On a characterization of PPT states.. Majewski, arXiv: quant-ph/0708.. 3980.. Geometry of sets of quantum maps:.. a generic.. positive map acting on a high-dimensional system is not completely positive.. St.. Szarek, E.. Werner, and.. Zyczkowski, arXiv:quant-ph/0710.. 1571.. Can quantum correlations be completely quantum?.. ukasz Pankowski, Barbara Synak-Radtke, arXiv:0705.. 1370, J.. Mubs and Hadamards of Order Six.. Bengtsson, W.. Bruzda, A.. Ericsson, J.. Larsson, W.. Tadej, K.. Zyczkowski, J.. 48, 052106.. Defect of a unitary matrix.. Zyczkowski, and W.. Slomczynski, ath.. RA/0702510.. A simple test of quantumness for a single system.. Robert Alicki, Nicholas Van Ryn, arXiv:0704.. 1962.. Karol Horodecki, Michal Horodecki, Pawel Horodecki, Debbie Leung, Jonathan Oppenheim,.. quant-ph/0608195, IEEE TIT (accepted).. Higher-rank numerical ranges of unitary and normal matrices ,.. Choi,.. Holbrook, D.. Kribs, and.. Zyczkowski, Operators and Matrices 1, 409-426 (2007).. Patrick Gill (Teddington).. Photoionization of strontium for precision ion trap experiments ,.. Letchumanan, M.. Brownnutt, R.. Thompson, P.. Gill and A.. Sinclair, Applied Physics.. B 87, 411 415 (2007).. Zero-point cooling and heating rate measurements of a single 88Sr+ ion ,.. Letchumanan, G.. Wilpers, M.. Brownnutt, P.. Sinclair, Physical Review A 75, 063425 (2007).. Monolithic microfabricated ion trap chip design for scalable quantum processors ,.. M Brownnutt, G Wilpers, P Gill, R C Thompson and A G Sinclair, New J.. 8, 232 (2006).. 21.. CNR.. Tommaso Calarco (Trento).. Decoherence induced by interacting quantum spin baths ,.. Rossini, T.. Calarco, V.. FazioPhys.. A 75, 032333 (2007).. Robust optimal quantum gates for Josephson charge qubits ,.. 99, 170501 (2007).. Controlled collisions of a single atom and ion guided by movable trapping potentials.. Zoller, Phys.. A 76, 033409 (2007).. Wigner crystals of ions as quantum hard drives ,.. Taylor, T.. Calarco: arXiv:0706.. 1951.. Structural phase transitions in low-dimensional ion crystals ,.. Calarco, G.. arXiv:0710.. 1831.. Increasing entanglement through engineered disorder ,.. Binosi, G.. De Chiara, S.. Montangero and A.. Recati, Phys.. B 76, 140405(R) (2007.. Decoherence by engineered quantum baths ,.. Fazio, J.. 40 (2007) 8033-8040.. Density Matrix Renormalization Group for Dummies , G.. De Chiara, M.. Rizzi, D.. Rossini and S.. Montangero, J.. of Comp.. and Theor.. Nanosc.. (in press).. Deterministic Entanglement via Molecular Dissociation in Integrated Atom Optics , B.. Pan, J.. Schmiedmayer, A.. Recati, G.. Astrakharchik, T.. A 75, 042312 (2007).. Jörg Schmiedmayer (Wien).. Fault-tolerant quantum repeater with atomic ensembles and linear optics.. Zhao,Y.. Schmiedmayer, and J.. A 76, 022329 (2007).. Non-equilibrium coherence dynamics in one-dimensional Bose gases.. Lesanovsky, B.. Fischer, J.. Schumm, Nature 449, 324 (2007).. A76, 022329-1 (2007).. Designing potentials by sculpturing wires.. Della Pietra, S.. Aigner, C.. Hagen, S.. Bar-Joseph, H.. Lezec, J.. A75, 063604-1 (2007).. Ultracold atoms in radio-frequency dressed potentials beyond the rotating-wave approximation.. Hofferberth, B.. Schmiedmayer, I.. A76, 013401-1 (2007).. Optimal quantum control of Bose-Einstein condensates in magnetic microtraps.. Hohenester, P.. Rekdal, A.. Borzi, J.. A75, 023602-1 (2007).. Collisional decoherence during writing and reading quantum states.. Fernholz, J.. A75, 040101-1 (2007).. High-fidelity entanglement via molecular dissociation in integrated atom optics.. A75, 042312-1 (2007).. Deterministic and storable single-photon source based on a quantum memory.. Chen, T.. Strassel, Z.. Zhao, J.. Pa, Phys.. 97, 173004-1 (2006).. Demonstration of a stable atom-photon entanglement source for quantum repeaters.. 99, 180505-1 (2007).. Synchronized independent narrow-band single photons and efficient generation of photonic entanglement.. Koch, T.. Strassel, Y.. Zhao, G.. Zhu, J.. 98, 180503-1 (2007).. Robust creation of entanglement between remote memory qubits.. 98, 240502-1 (2007).. Robust long-distance quantum communication with atomic ensembles and linear optics.. 98, 240502 (2007).. A robust atom-photon entanglement source for quantum repeaters.. 99, 180505 (2007).. Memory-built in quantum teleportation with photonic and atomic qubits.. Pan, arXiv:0705.. 1256.. An integrated atom counter.. Schmiedmayer, submitted to Nature Physics (2007).. Publications of the SCALA consortium.. (2005-2006).. Letters in high-impact journals (Nature, Science, Physical Review Letters): 27.. Articles in international refereed journals (Physical Review.. etc): 100.. Articles in Books and Proceedings: 11.. Preprints (arXiv): 62.. Total number of SCALA publications during Year 1: 200.. Quantum interference between two single photons emitted by independently trapped atoms ,.. Beugnon, M.. Dingjan, B.. Darquié, G.. Grangier, Nature 440, 779 (2006).. Ultrafast Quantum State Control of a Single Trapped Neutral Atom ,.. Matthew P.. Jones, Jerome Beugnon, Alpha Gaëtan, Junxiang Zhang, Gaetan Messin, Antoine Browaeys, Philippe Grangier, arXiv/quant-ph/0609134.. Fournet, C.. Armellin, R.. Grangier, arXiv/quant-ph/0610071.. Experimental evidence for the breakdown of a Hartree-Fock approach in a weakly interacting Bose gas ,.. Trebbia, J.. Estève, C.. Bouchoule, submitted to Phys.. , arXiv.. :quant.. -ph/0606247.. Experimental observation of density fluctuations in an elongated Bose gas: ideal gas and quasi-condensate regimes ,.. Estève, J.. Trebia, T.. 96, 130403 (2006), arXiv.. :condmat.. /0510397.. Theory for a Hanbury Brown Twiss experiment with a pulsed atomic beam ,.. Viana Gomes, A.. Perrin, M.. Westbrook, M.. Belsley, to appear in Phys.. A, arXiv:quant-ph/0606147.. Entanglement and decoherence of N atoms and a mesoscopic field in a cavity ,.. Meunier, A.. Le Diffon, C.. Rueff, P.. Degiovanni, J.. Raimond, Phys.. A 74, 033802 (2006):.. Raimond, à paraître, Journal of Modern Optics DOI 10.. 1080/09500340600741124.. Realization of a superconducting atom chip ,.. 97 200405 (2006).. , quant-ph/0610019.. Microwave potentials and optimal control for robust quantum gates on an atom chip ,.. Treutlein, T.. Hänsch, J.. Reichel, A.. Negretti, M.. Cirone and T.. A 74, 022312 (2006).. Kuhn, quant-ph/0610227, accepted in Phys.. Scheme for generating a sequence of single photons of alternating polarisation ,.. Kuhn, accepted by J.. quant-ph/0603083.. Three-dimensional cavity cooling and trapping in an optical lattice ,.. Murr, S.. Nußmann, T.. Puppe, M.. Rempe, Phys.. A 73, 063415 (2006).. Characterization of single photons using two-photon interference ,.. Legero, T.. Rempe, Adv.. 53, 253 (2006).. Time-resolved and state-selective detection of single freely falling atoms ,.. Bondo, M.. Hennrich, T.. Legero, G.. Kuhn, Opt.. 264, 271 (2006).. Large velocity capture range and low temperatures with cavities ,.. Murr, Phys.. 96, 253001 (2006).. Momentum diffusion of coupled atom-cavity oscillators ,.. Maunz, P.. Pinkse, T.. Schuster, D.. A 74, 043412 (2006).. Book :.. Cooling and Trapping in Cavity Quantum Electrodynamics ,.. Kuhn, P.. Nußmann, P.. Schuster, N.. Syassen, and B.. Weber, Laser Spectroscopy XVII , E.. Hinds, A.. Ferguson, and E.. Riis, (Eds.. ), World Scientific, Singapore, 178-188 (2005).. Advances in Atomic, Molecular and Optical Physics 53 , G.. Rempe and M.. Scully (Eds.. ), Elsevier-Academic Press, 1-466 (2006).. Rempe, Lectures on Quantum Information , D.. Book.. chapter :.. Light forces in cavity QED ,.. Murr, Atomic Physics 20 , R.. Blatt, R.. Grimm, and P.. Zoller (Eds.. ), American Institute of Physics Conference Proceedings, New York, 136-143 (2006).. Magazine :.. Einzelne Atome im optischen Resonator ,.. Kuhn, Physik in unserer Zeit 1/2006(37), Seite 6.. Effective Spin Quantum Phases in Systems of Trapped Ions ,.. 72, 063407 (2005); http://arxiv.. org/abs/quant-ph/0509197.. Quantum Manipulation of Trapped Ions in Two Dimensional Coulomb Crystals ,.. 96, 250501 (2006); http://arxiv.. org/abs/quant-ph/0601148.. Cirac, http://arxiv.. org/abs/quant-ph/0611093.. How much entanglement can be generated between two atoms by detecting photons?.. Garcia-Ripoll, and J.. org/abs/quant-ph/0608158.. Delocalized Entanglement of Atoms in optical Lattices ,.. Vollbrecht and J.. org/abs/quant-ph/0611132.. Quantum simulations under translational symmetry ,.. Kraus, M.. Wolf, and J.. org/abs/quant-ph/0607094.. Field-induced quantum disordered phases in S=1/2 weakly-coupled dimer systems with site dilution ,.. B 76, 144418 (2006); http://arxiv.. org/abs/cond-mat/0602524.. Mott glass in site-diluted S=1 antiferromagnets with single-ion anisotropy ,.. Roscilde and S.. Haas, http://arxiv.. org/abs/cond-mat/0605200.. Pyramidal micromirrors for microsystems and atom chips ,.. Trupke, M; Ramirez-Martinez, F; Curtis, EA; Ashmore, JP; Eriksson, S; Hinds, EA; Moktadir, Z; Gollasch, C; Kraft, M; Prakash, GV; Baumberg, JJ, Appl.. 88 (7): Art.. 071116 (2006).. Microfabricated high-finesse optical cavity with open access and small volume ,.. Trupke, M; Hinds, EA; Eriksson, S; Curtis, EA; Moktadir, Z; Kukharenka, E; Kraft, M,.. 87 (21): Art.. 211106 (2005).. Comment on « Spin Decoherence in Superconducting Atom Chips » ,.. Stefan Scheel, E.. Hinds, P.. Knight, arxiv.. -ph/0610095.. (in press); quant-ph/0607197.. Single atom quantum walk with 1D optical.. superlattices.. (in press); quant-ph/0606087.. Schoen, J.. (in press); quant-ph/0602038.. Single-qubit rotations in 2D optical lattices with multi-qubit addressing ,.. Robust entanglement through macroscopic quantum jumps ,.. Metz, M.. 97, 040503 (2006).. Spatial decoherence near metallic surfaces ,.. A 73, 032902 (2006).. Repeat-until-success quantum computing using stationary and flying qubits ,.. Lim, S.. Barrett, A.. Beige, P.. Kok, and L.. Kwek, Phys.. A 73, 012304 (2006).. Designer atoms for quantum metrology ,.. Roos, M.. Riebe, R.. Blatt, Nature 443, 316-319 (2006).. Ionen in Reih und Glied ,.. Blatt, Physik Journal 4, 37 (2005).. Scalable multi-particle entanglement of trapped ions ,.. Roos, J.. Benhelm, D.. Chek-al-kar, M.. Chwalla, T.. Körber, U.. Rapol, M.. Schmidt, C.. Blatt, Nature 438, 643-646 (2005).. Preprint :.. 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