************************************ * QUANTUM OPTICS AND ATOM OPTICS * * IN AUSTRALASIA * * * * * * * * MONTHLY NEWSLETTER * * VOL X, NO 11 * * * CONTENTS: * November 2002 * * * 0. EDITORIAL NOTE * ISSN 1325-6467 * Edited by: 1. ABSTRACTS * * Alexei Gilchrist 2. VACANCIES * \ | / * Physics, University of Queensland, 3. BUY/SELL * \__|__/ * QLD 4072, Australia. 4. MISC NEWS * | * email: alexei@physics.uq.edu.au 5. CONFERENCES * | * phone: +61 7 3365 2422 * | * fax: +61 7 3365 1242 Available on WWW at: * * http://www.physics.uq.edu.au/qonews =============================================================================== 0. EDITORIAL NOTE =============================================================================== Sorry for the long absence of any newsletters. PLEASE NOTE: o The deadline for the Lectureship in Experimental Physics is 25th November o The deadline for the Obergurgl meeting is December 1 Alexei =============================================================================== 1. ABSTRACTS =============================================================================== Continuous Variables (2,3) Threshold Quantum Secret Sharing Schemes A.M. Lance, T. Symul, W.P. Bowen, T. Tyc, B.C. Sanders, P.K. Lam quant-ph/0210188 We present two experimental schemes to perform continuous variable (2,3) threshold quantum secret sharing on the quadratures amplitudes of bright light beams. Both schemes require a pair of entangled light beams. The first scheme utilizes two phase sensitive optical amplifiers, whilst the second uses an electro-optic feedforward loop for the reconstruction of the secret. We examine the efficacy of quantum secret sharing in terms of fidelity, as well as the signal transfer coefficients and the conditional variances of the reconstructed output state. We show that both schemes in the ideal case yield perfect secret reconstruction. ---------------------------------------------------------------------- Entangling power and operator entanglement in qudit systems Xiaoguang Wang, Barry C Sanders quant-ph/0210156 We establish the entangling power of a unitary operator on a general finite-dimensional bipartite quantum system with and without ancillas. Significantly, we demonstrate that the entangling power of a general controlled unitary operator acting on two equal-dimensional qudits is proportional to the corresponding operator entanglement if linear entropy is adopted as the quantity representing the degree of entanglement. We also discuss the entangling power and operator entanglement of three representative quantum gates on qudits: the SUM, double SUM, and SWAP gates. ---------------------------------------------------------------------- Separability criterion for separate quantum systems M.G. Raymer, A.C. Funk, B.C. Sanders, H. de Guise quant-ph/0210137 Entanglement, or quantum inseparability, is a crucial resource in quantum information applications, and therefore the experimental generation of separated yet entangled systems is of paramount importance. Experimental demonstrations of inseparability with light are not uncommon, but such demonstrations in physically well-separated massive systems, such as distinct gases of atoms, are new and present significant challenges and opportunities. Rigorous theoretical criteria are needed for demonstrating that given data are sufficient to confirm entanglement. Such criteria for experimental data have been derived for the case of continuous-variable systems obeying the Heisenberg-Weyl (position- momentum) commutator. To address the question of experimental verification more generally, we develop a sufficiency criterion for arbitrary states of two arbitrary systems. When applied to the recent study by Julsgaard, Kozhekin, and Polzik [Nature 413, 400 - 403 (2001)] of spin-state entanglement of two separate, macroscopic samples of atoms, our new criterion confirms the presence of spin entanglement. ---------------------------------------------------------------------- Superpositions of SU(3) coherent states via a nonlinear evolution Kae Nemoto, Barry C. Sanders Journal-ref: J. Phys. A: Math. Gen 34,2051 (2001) quant-ph/0210067 We show that a nonlinear Hamiltonian evolution can transform an SU(3) coherent state into a superposition of distinct SU(3) coherent states, with a superposition of two SU(2) coherent states presented as a special case. A phase space representation is depicted by projecting the multi-dimensional $Q$-symbol for the state to a spherical subdomain of the coset space. We discuss realizations of this nonlinear evolution in the contexts of nonlinear optics and Bose--Einstein condensates. ---------------------------------------------------------------------- Extending Heisenberg's measurement--disturbance relation to the twin-slit case H.M. Wiseman quant-ph/0210065 Heisenberg's position-measurement--momentum-disturbance relation is derivable from the uncertainty relation $\sigma(q)\sigma(p) \geq \hbar/2$ only for the case when the particle is initially in a momentum eigenstate. Here I derive a new measurement--disturbance relation which applies when the particle is prepared in a twin-slit superposition and the measurement can determine at which slit the particle is present. The relation is $d \times \Delta p \geq 2\hbar/\pi$, where $d$ is the slit separation and $\Delta p=D_{M}(P_{f},P_{i})$ is the Monge distance between the initial $P_{i}(p)$ and final $P_{f}(p)$ momentum distributions. ---------------------------------------------------------------------- Quantum information science and complex quantum systems Michael A. Nielsen quant-ph/0210005 What makes quantum information science a science? This paper explores the idea that quantum information science may offer a powerful approach to the study of complex quantum systems. ---------------------------------------------------------------------- The entanglement of indistinguishable particles shared between two parties H.M. Wiseman, John A. Vaccaro quant-ph/0210002 Using an operational definition we quantify the entanglement, $E_P$, between two parties who share an arbitrary pure state of N indistinguishable particles. We show that $E_P \leq E_M$, where $E_M$ is the bipartite entanglement calculated from the mode-occupation representation. Unlike $E_M$, $E_P$ is _super-additive_. For example, $E_P=0$ for any single-particle state, but the state $\ket{1}\ket{1}$, where both modes are split between the two parties, has $E_P = 1/2$. We discuss how this relates to quantum correlations between particles, for both fermions and bosons. ---------------------------------------------------------------------- There is no unmet requirement of optical coherence for continuous-variable quantum teleportation H.M. Wiseman quant-ph/0209163 ---------------------------------------------------------------------- Efficient classical simulation of measurements in optical quantum information Stephen D. Bartlett, Barry C. Sanders quant-ph/0209133 ---------------------------------------------------------------------- Entanglement of two-mode Bose-Einstein condensates Andrew P. Hines, Ross H. McKenzie, Gerard J. Milburn quant-ph/0209122 ---------------------------------------------------------------------- Entanglement gauge and the non-Abelian geometric phase with two photonic qubits Karl-Peter Marzlin, Stephen D. Bartlett, Barry C. Sanders quant-ph/0209098 ---------------------------------------------------------------------- Optimal Remote State Preparation Dominic W. Berry, Barry C. Sanders quant-ph/0209093 ---------------------------------------------------------------------- An experimental investigation of criteria for continuous variable entanglement W.P. Bowen, R. Schnabel, P.K. Lam, T.C. Ralph quant-ph/0209001 ---------------------------------------------------------------------- A Perturbative Approach to Non-Markovian Stochastic Schrodinger Equations Jay Gambetta, H.M. Wiseman quant-ph/0208169 ---------------------------------------------------------------------- Classical Dynamics as Constrained Quantum Dynamics Stephen D. Bartlett, David J. Rowe quant-ph/0208168 ---------------------------------------------------------------------- Continuous quantum nondemolition feedback and unconditional atomic spin squeezing L.K. Thomsen, S. Mancini, H.M. Wiseman quant-ph/0208160 ---------------------------------------------------------------------- Conditional phase shifts using trapped atoms A. Gilchrist, G.J. Milburn quant-ph/0208157 ---------------------------------------------------------------------- Unconditional Continuous Variable Dense Coding T.C.Ralph, E.H.Huntington quant-ph/0208117 ---------------------------------------------------------------------- Stokes operator squeezed continuous variable polarization states Roman Schnabel, Warwick P. Bowen, Nicolas Treps, Timothy C. Ralph, Hans-A. Bachor, Ping Koy Lam quant-ph/0208103 ---------------------------------------------------------------------- Multipartite Entanglement and Quantum State Exchange D.T. Pope, G.J. Milburn quant-ph/0208098 ---------------------------------------------------------------------- Measurements of Diffusion Resonances for the Atom Optics Quantum Kicked Rotor M.E.K. Williams, M.P. Sadgrove, A.J. Daley, R.N.C. Gray, S.M. Tan, A.S. Parkins, R. Leonhardt, N. Christensen quant-ph/0208090 ---------------------------------------------------------------------- Quantum information science as an approach to complex quantum systems Michael A. Nielsen quant-ph/0208078 ---------------------------------------------------------------------- Quantum dynamics as a physical resource Michael A. Nielsen, Christopher M. Dawson, Jennifer L. Dodd, Alexei Gilchrist, Duncan Mortimer, Tobias J. Osborne, Michael J. Bremner, Aram W. Harrow, Andrew Hines quant-ph/0208077 ---------------------------------------------------------------------- Quantum Teleportation of Optical Quantum Gates Stephen D. Bartlett, William J. Munro quant-ph/0208022 ---------------------------------------------------------------------- From Qubits to Continuous-Variable Quantum Computation Barry C Sanders, Stephen D. Bartlett, Hubert de Guise quant-ph/0208008 =============================================================================== 2. VACANCIES =============================================================================== Lectureship in Experimental Physics The closing date for receipt of completed applications is 25th November 2002 Applications are invited for a lectureship in Experimental Physics in the Department of Physics and Astronomy. The successful applicant will join the newly established Centre for Molecular and Optical Sciences (CeMOS), a major new research initiative led by Professor Nigel Mason. Sited in a brand new suite of research laboratories, CeMOS is being developed to include five areas of fundamental research: * The study of quantum phenomena in atom traps and development of quantum optics * Laboratory Astrophysics * Spectroscopy related to the atmospheric studies * Molecular interactions with radiation with particular emphasis on biomolecules; and * The study of collision processes in technological plasmas. All these areas have strong overlaps with active research groups at the Open University and other UK Universities. In addition much of the work forms part of larger European research programmes co-ordinated by Professor Mason and funded by the EU. While applications are invited in any of the above areas, some preference will be given to an experimentalist experienced in cold atom/molecule physics. Following the retirement of Dr Alan Durrant, the Centre has a well furbished 'cold atom laboratory', complete with operational Rubidium MOT, available for immediate use. In addition to research duties, the successful applicant will be expected to take a full part in developing and teaching the Open University's unique undergraduate programme and will also be expected to contribute to the graduate teaching programme. Appointment will be made on the Lecturer A salary scale £22191 - £26270 or the Lecturer B scale £26270 - £33679, depending on experience. If you wish to discuss the post informally, please contact Professor Nigel Mason, email N.J.Mason@open.ac.uk. Further particulars, an application form and access details for disabled applicants are available from Wendy Pereira, Recruitment Co-ordinator, Department of Physics and Astronomy, the Open University, Walton Hall, Milton Keynes MK7 6AA, email W.M.Pereira@open.ac.uk. Please quote ref 16997/ ------------------------------------------------------------------------------- Lectureships and Research Fellow University of St Andrews, St Andrews Fife, United Kingdom Closing date: 15 Jan 2003 o LECTURESHIP IN THEORETICAL PHYSICS ?22,191-?33,679 PA This post is to continue the development of Theoretical Physics in the areas of condensed matter physics and modern optics. We require an outstanding individual able to build an original and independent research profile in theoretical physics, but at the same time create collaborative links with our experimental research activities. An equally important aim of the post is to continue to provide an excellent education in Theoretical Physics. For informal enquiries please e-mail: ulf@st-andrews.ac.uk or for more information see our we site: www.st-and.ac.uk/academic/ hysics/ Ref: J 047/6713/02 o LECTURESHIP IN PHOTONICS ?22,191-?33,679 PA Your research interests should relate to, or complement those, of our existing research groups - which cover ultrafast lasers for science and technology, microchip lasers, optical parametric oscillators, quantum/nonlinear optics, quantum well semiconductors, polymer optoelectronics, photonic crystals, molecular photonics, optical tweezing/ micro-manipulation for cold atom optics and biology, photobiology and photomedicine. The School currently leads "The Ultrafast Photonics Colla oration", a major inter-disciplinary/ inter-institutional research collaboration. It has recently established a clean room for nanofabrication of inorganic and organic semiconductor optoelectronic devices and a multi-user, widely tunable femtosecond laser facility. A Photonics Innovation Centre acts as an incubator for the commercialisation of our research. Photonics-related teaching covers undergraduate degrees in Physics, Physics with Photonics, Microelectronics & Photonics and, at graduate level, a Masters Training Package in Photonics & Optoelectronic Devices and an Engineering Doctorate (Eng.D.) in Photonics. For informal enquiries please contact Professor Alan Miller, Head of School, tel: +44 1334 463122 or e-mail: hospanda@st-and.ac.uk or for more information see our we site: www.st-and.ac.uk/academic/physics Ref: J 049/6714/02 o RESEARCH FELLOW IN THEORETICAL PHYSICS ?18,265-?27,339 PA This is a two year post, available from 1 March 2003, for postdoctoral studies in theoretical physics. We plan to explore the fascinating quantum properties of artificial black holes, effects that bridge quantum optics, Bose-Einstein condensation and general relativity. You should be a talented theorist with an inquisitive mind and a broad and solid education. For informal enquiries please contact Professor Ulf Leonhardt, e-mail ulf@st-andrews.ac.uk or for further information see our we site: www.st-and.ac.uk/~ulf/ Ref: JB048/9410/02 Application packs for all posts are available from Human Resources, University of St Andrews, College Gate, North Street, St Andrews, Fife KY16 9AJ, (tel: 01334 462571, fax: 01334 462570 or email: Jobline@st-andrews.ac.uk). We regret applications cannot be made by e-mail. Please quote the appropriate reference. Closing date: 15 January 2003. =============================================================================== 5. CONFERENCES / WORKSHOPS =============================================================================== FRISNO-7: French-Israeli Symposium on Nonlinear and Quantum Optics February 16-21, 2003 deadline for submission of abstracts is November 1, 2002 Les Houches, France http://www.weizmann.ac.il/frisno/ The series of FRISNO symposia has been going on for over a decade, bringing together a scientific community dedicated to Nonlinear and Quantum Optics from Israel, France, the rest of Europe, the US, Japan, and Russia. Keeping up with the tradition, this upcoming meeting will provide an excellent opportunity to renew old connections and form new ones. We sincerely hope you will be joining us in Les Houches next February, to present your latest results, and make contact with the other participants. ------------------------------------------------------------------- BECQI'03 - Workshop on Bose-Einstein Condensation and Quantum Information 16-20 February 2003 Registration: 15 January 2003 Caloundra, Sunshine Coast, Australia http://www.physics.uq.edu.au/BECQI/ The workshop will cover hot topics in BEC and Quantum Information, from both theory and experiment. A particular focus will be on quantum aspects of matter waves and macroscopic quantum states, going beyond the methods and predictions of mean-field theory. This will include advances in analytical and computational methods, the latest experimental results probing the quantum nature of BECs, and applications of BEC to quantum information. NB The number of participants will be limited to 55-65. ------------------------------------------------------------------- Obergurgl Meeting: Quantum optics 23 February-1 March 2003 Deadline: 1 December, 2002 Obergurgl, Austria. http://th-physik.uibk.ac.at/qo/obergurgl/ This meeting will cover different aspects of Quantum Optics. ------------------------------------------------------------------- 3rd ESF meeting - Quantum Information Theory and Quantum Computing 15th-22nd March 2003 registration deadline: 24th December 2002 Ettore Majorana Center in Erice, Italy. http://www.lsr.ph.ic.ac.uk/~plenio/erice2003/erice2003c.html The meeting follows earlier successful programme meetings held in Cambridge in 1999 and Gdansk in 2001 and will focus on "Advances in quantum information processing: from theory to experiments". ------------------------------------------------------------------- GRC conference on Quantum Information Science March 23-28, 2003 Ventura, California. http://www.grc.org/programs/2003/quantinf.htm Quantum Information Science will be a yearly conference focusing on the rapidly growing field of Quantum Information Processing. The primary focus of the conference will be on physical and theoretical aspects that arise in implementation of quantum information processing for computation or communication. The conference will bring together researchers from the diverse fields of physics, computer science, mathematics, chemistry, materials science, and engineering, with the common interest of increasing our understanding of how to formulate, manipulate, and process information using physical systems that operate on quantum mechanical principles. ------------------------------------------------------------------- Fluctuations and Noise 2003 1-4 June 2003 Abstract Due: 25 November 2002 Santa Fe, New Mexico USA http://spie.org/Conferences/Calls/03/fn/ Containing six parallel conferences: * Fluctuations and Noise in Biological, Biophysical, and Biomedical Systems * Fluctuations and Noise in Photonics and Quantum Optics * Noise as a Tool for Studying Materials * Noise in Devices and Circuits * Noise in Complex Systems and Stochastic Dynamics * Noise and Information in Nano-electronics, Sensors, and Standards ------------------------------------------------------------------- 8th International Conference on Squeezed States and Uncertainty Relations 9-13 June, 2003 Puebla, Mexico http://www-optica.inaoep.mx/ICSSUR/8th.html The program of the Conference will reflect the continuing importance of fundamental quantum physics and the increasing importance of applications in the domain of quantum optics. Contributed experimental and theoretical papers in all of these topics are solicited: o Squeezed states and uncertainty relations o Quantum-state generation and characterization o Phase space and group representations in quantum physics o Quantum transforms in signal analysis and quantum physics o Quantum interference and entanglement o Quantum-like and mesoscopic systems o Foundations of quantum mechanics and quantum optics o Trapped atoms and degenerate gases o Quantum chaos and quantum control o Quantum information and communication o Quantum computing ------------------------------------------------------------------- Benasque Center for Science - Quantum Information 22nd June - 11th July 2003 Deadline for applications is March 15. Barcelona, Spain http://sophia.ecm.ub.es/2003qi/2003qi.htm A three-week Benassque session will be devoted to recent progress in Quantum Information and Communication. Special topics that will be covered during the meeting are: * Theory of Quantum Information,Entanglement, Quantum Algorithms,... QCD * Experiments in Quantum Information, Trapped ions, photons, NMR, Superconducting currents, quantum dots, ------------------------------------------------------------------- Les Houches Summer School on 'Quantum entanglement and information processing' 30 June - 25 July, 2003. Registration deadline: March 7, 2003 Les Houches, France. http://www-houches.ujf-grenoble.fr/index-en.html The recent discovery that the laws of quantum physics could be used for efficient information processing or transmission led to a considerable upsurge of interest in developing a deeper understanding of quantum mechanics, and in fabricating genuine quantum processors. This new field gathers around common objectives various communities, such as theoretical physics, quantum optics or solid state physics. On the theoretical side, the major advances concern quantum algorithms and quantum error correction codes. On the experimental side, significant advances have been realized in quantum optics, solid state physics and nuclear magnetic resonance. In particular, quantum logic gates have been demonstrated, and small-size quantum algorithms have been operated. This school aims to provide a comprehensive overview of the theoretical and experimental aspects of quantum entanglement and information processing. It is opened to young researchers interested in learning the essentials of this new field. Introductory lectures will provide them with a common background, while more specialized lectures and seminars will give an up to date panorama. ------------------------------------------------------------------- ICOLS 03: 16th International Conference on Laser Spectroscopy 13-18 July 2003 Preregistration: 13 December 2002 Earlybird registration and abstracts: 7 April 2003 Palm Cove, AUSTRALIA http://www.swin.edu.au/rescentres/soll/icols03/icols.html Following the tradition of ICOLS conferences, the program will consist of single sessions of invited talks and posters covering the latest developments in Laser Spectroscopy and related topics. Scheduling will allow significant time for informal discussions. The number of participants will be limited to about 250-300. ------------------------------------------------------------------- 4th European QIPC Workshop 14th - 17th July 2003 Oxford, UK