Bulletin of the American Physical Society
40th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 54, Number 7
Tuesday–Saturday, May 19–23, 2009; Charlottesville, Virginia
Session S1: Quantum Information with Matter and Light |
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Chair: Mirko Lobino, University of Calgary Room: Chemistry Building 402 |
Friday, May 22, 2009 2:00PM - 2:30PM |
S1.00001: Towards Quantum Repeaters Invited Speaker: The ultimate limit of direct point to point quantum key distribution is around 300-500 km. Longer distances fiber-based quantum communication will require both high-fidelity entanglement swapping and multi-mode quantum memories. A new protocol for an efficient multimode quantum memory based on atomic ensembles has been developed and demonstrated. The rare-earth ions ensemble is ``frozen'' in a crystal inside a cryostat. The protocol, named AFC (Atomic Frequency Comb) is inspired from photon echoes, but avoids any control light pulse after the single-photon(s) is (are) stored in the medium, thus avoiding any noise due to fluorescence. First results on the new protocol for quantum memories in Nd:YVO4 doped crystals demonstrate a quantum light-matter interface at the single-photon level. The coherence of the re-emitted photons is investigated in an interference experiment showing net visibilities above 95{\%}. Further results in Nd:YSO (Geneva), Tm:YAG (Paris) and Pr:YSO (Lund) shall also be presented. Many hundreds of km long quantum communication is a long term objective. Many of the necessary building blocks have been demonstrated, but usually in independent experiments and with insufficient fidelities and specifications to meet the goal. Still, today's the roadmap is relatively clear and a lot of interesting physics shall be found along the journey. [Preview Abstract] |
Friday, May 22, 2009 2:30PM - 3:00PM |
S1.00002: Quantum dots in photonic crystals: from quantum information processing to single photon nonlinear optics Invited Speaker: Quantum dots in photonic crystals are interesting both as a testbed for fundamental cavity quantum electrodynamics (QED) experiments, as well as a platform for quantum and classical information processing. Quantum dot-photonic crystal cavity QED has been probed both in photoluminescence and coherently, by resonant light scattering from such a system [1]. In the latter case, both intensity and photon statistics of the reflected beam have been analyzed as a function of wavelength, leading to observation of effects such as photon blockade and photon induced tunneling - for the first time in solid state [2]. The system has also been employed to achieve a controlled phase and amplitude modulation between two modes of light at the single photon level [3] - nonlinearity observed so far only in atomic physics systems. These demonstrations lie at the core of a number of proposals for quantum information processing, and could also be employed to build novel devices, such as optical switches controlled at a single photon level. \\[4pt] [1] Dirk Englund, Andrei Faraon, Ilya Fushman, Nick Stoltz, Pierre Petroff, and Jelena Vuckovic, ``Controlling cavity reflectivity with a single quantum dot," \it Nature \rm, vol. 450, No. 7171, pp. 857-861, December 2007\\[0pt] [2] Andrei Faraon, Ilya Fushman, Dirk Englund, Nick Stoltz, Pierre Petroff, and Jelena Vuckovic, ``Coherent generation of nonclassical light on a chip via photon-induced tunneling and blockade," \it Nature Physics \rm, Vol. 4, pp. 859 - 863 (2008)\\[0pt] [3] Ilya Fushman, Dirk Englund, Andrei Faraon, Nick Stoltz, Pierre Petroff, and Jelena Vuckovic, ``Controlled phase shift with a single quantum dot," \it Science \rm, vol. 320, number 5877, pp. 769-772 ( 2008) [Preview Abstract] |
Friday, May 22, 2009 3:00PM - 3:30PM |
S1.00003: Quantum networking with trapped ions and photons Invited Speaker: Quantum networks using light as a carrier of quantum information between remote quantum memories could enable distributed and scalable processing of quantum information and quantum communication. I describe a series of experiments that link multiple trapped atomic ions through the interference and coincidence detection of photons emitted by each ion. This includes the implementation of a probabilistic gate between the hyperfine clock states of two ytterbium ions separated by about 1 meter, and its application to the teleportation of quantum information between remote atomic ions. [Preview Abstract] |
Friday, May 22, 2009 3:30PM - 4:00PM |
S1.00004: Long-lived Quantum Memories Invited Speaker: A memory based on hyperfine atomic coherences (spin waves) which can be read out optically at the single photon level, when classical noise sources have been eliminated, is a quantum memory. The spin waves are generally sensitive to ambient magnetic fields that limit their storage time to tens of microseconds. By optical pumping of the atoms and use of the clock coherence sensitivity to magnetic fields can be greatly reduced. Even in ultra-cold atomic samples motional dephasing becomes important on a scale of hundreds of microseconds. We present results of our work which circumvent both of these difficulties to achieve an atomic memory with a lifetime of several milliseconds. We will discuss various applications of the long-lived atomic memory, including deterministic single photon sources, matter qubit rotations, and matter-light entanglement. [Preview Abstract] |
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