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Statistical properties of a Raman three-level atom interacting with a cavity field

AIP Conference Proceedings 2012年第1期1482卷 373-375页

作者： A-H. M. Ahmed Lee Yen Cheong Nordin Zakaria N. Metwally H. Eleuch HPC Service Center Universiti Teknologi PETRONAS Seri Iskandar 31750 Tronoh Perak Malaysia Department of Fundamental and Applied Science Universiti Teknologi PETRONAS Seri Iskandar 31750 Tronoh Perak Malaysia Mathematics Department College of Science Bahrain University 32038 Kingdom of Bahrain Bahrain Institute for Quantum Science and Engineering and Department of Physics and Astronomy Texas A&M University College Station Texas 77843 USA and Max Planck Institute for Physics of Complex Systems 01187 Dresden Germany

We investigate the linear entropy of a degenerate Raman process involving two degenerate Rydberg energy levels of an atom interacting with a cavity field. It is shown that a long living entanglement can be obtained for particular initial state settings. We demonstrate how these states can be observed experimentally and study the feasibility of the implementation with present day technology.

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Coupled nanocavity-grating resonances: Large plasmonic enhancement of nonlinear optical phenomena

Coupled nanocavity-grating resonances: Large plasmonic enhan...

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作者： Capasso, Federico Genevet, Patrice Tetienne, Jean-Philippe Gatzogiannis, Evangelos Blanchard, Romain Kats, Mikhail A. Scully, Marlan O. School of Engineering and Applied Sciences MA 02138 United States Center for Nanoscale Systems Harvard University Cambridge MA 02138 United States Institute for Quantum Studies Department of Physics Texas A and M University College Station TX 77843 United States College of Engineering and Applied Science Princeton University Princeton NJ 08544 United States

A grating of nanogrooves is designed to form resonant nanocavities in a gold film. The large plasmonic enhancement of fourwave mixing makes such structures attractive for surface nonlinear optics. © 2011 OSA.

ISBN: (纸本)9781557529107

关键词： Plasmonics

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Classical stability of BTZ black holes in new massive gravity

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Physical Review D 2011年第2期84卷 024044-024044页

作者： Yun Soo Myung Yong-Wan Kim Taeyoon Moon Young-Jai Park Institute of Basic Science and School of Computer Aided Science Inje University Gimhae 621-749 Korea Center for Quantum Spacetime Sogang University Seoul 121-742 Korea Department of Physics and Department of Service Systems Management and Engineering Sogang University Seoul 121-742 Korea

We study the stability of the BTZ black hole in the new massive gravity. This is a nontrivial task because the linearized equation around the BTZ black hole background is a fourth-order differential equation. Away from the critical point of m2ℓ2=1/2, this fourth-order equation is split into two second-order equations: one describes a massless graviton, and the other is designed for a massive graviton, which could be obtained from the Fierz-Pauli action. In this case, calculating quasinormal modes leads to confirming the stability of the BTZ black hole. At the critical point, we derive two left- and right-logarithmic quasinormal modes from the logarithmic conformal field theory. Finally, we identify two s massive modes propagating on the black hole background through the conventional black hole stability analysis.

关键词： GRAVITATIONAL waves GENERAL relativity (physics) BLACK holes (Astronomy) FIELD theory (physics) DIFFERENTIAL equations quantum gravity

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Measurement of initial dissolution rate of P0798 simulated HLW glass by using micro-reactor flow-through test method

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MRS Online Proceedings Library (OPL) 2011年第1期1193卷 307-307页

作者： H. Makigaki Y. Inagaki K. Idemitsu T. Arima S. Mitsui T. Banba K. Noshita Department of Applied Quantum Physics & Nuclear Engineering Kyushu University Japan Geological Isolation Research and Development Directorate Japan Atomic Energy Agency Japan Nuclear Safety Research Center Japan Atomic Energy Agency Japan Energy & Environmental Systems R&D Laboratory Hitachi Ltd Japan

We applied a new type of flow-through test method using micro-reactor consisting of a simple test apparatus with compact size to measurement of the dissolution rate of a Japanese type of simulated waste glass (P0798 glass). In this test method, a solution flows through a micro-channel (20 mm length, 2 mm width, 0.16 mm depth) in contact with a face of coupon shaped glass specimen, and the output solution is retrieved at certain intervals to be analyzed for determination of the glass dissolution rate. By using this test method the initial dissolution rate of glass matrix or forward dissolution rate was measured as a function of pH (3 to 11) and temperature (25°C to 90°C). The present test results indicated that the initial dissolution rate has ‘V-shaped’ pH dependence, and the effect of pH on the dissolution rate decreases with increase in temperature similar to the results measured by using the Single-pass flow-through (SPFT) method. The present test results also indicated that the dissolution of B is controlled by diffusion process and that of Si is controlled by surface reaction process.

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Measurement of HLW glass dissolution/alteration kinetics by using micro-reactor flow-through test method

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MRS Online Proceedings Library (OPL) 2011年第1期1193卷 219-219页

作者： Y. Inagaki S. Mitsui H. Makigaki K. Idemitsu T. Arima T. Banba K. Noshit 1 Department of Applied Quantum Physics & Nuclear Engineering Kyushu University Japan Geological Isolation Research and Development Directorate Japan Atomic Energy Agency Japan Nuclear Safety Research Center Japan Atomic Energy Agency Japan Energy & Environmental Systems R&D Laboratory Hitachi Ltd Japan

A new type of flow-through test method using micro-reactor was developed and applied to measurement of the dissolution/alteration kinetics for a Japanese type of simulated HLW glass, P0798. In this test method, a face of coupon shaped glass specimen (30mm × 10mm × 4mm size) is in contact with a micro-channel (20mm length, 2mm width, 0.16mm depth) constructed on a PTFE (Teflon®) plate, and a solution is injected into the inlet of micro-channel at a constant rate. The injected solution, which flows through the micro-channel reacting with the glass to the outlet, is retrieved at certain intervals to be analyzed for determination of the glass dissolution/alteration rate. After the test, the glass specimen removed from the micro-reactor is subjected to surface analyses. This test method has major features as follows, 1) any controlled solution condition can be provided over the test duration, 2) a relatively high S/V ratio can be provided by use of micro-reactor in spite of using coupon shaped glass specimen, which results in precise and consistent analyses of both the solution and the reacted glass surface, 3) the test apparatus is simple with compact size and easy operation, which allows a flexible setup of test conditions. By use of this test method the dissolution/alteration rate for P0798 glass was measured as a function of pH, temperature, and time, and the results indicated that this test method is applicable and suitable for evaluation of the dissolution/alteration kinetics.

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Coupled nanocavity-grating resonances: Large plasmonic enhancement of nonlinear optical phenomena

Coupled nanocavity-grating resonances: Large plasmonic enhan...

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Conference on Lasers and Electro-Optics (CLEO)

作者： Federico Capasso Patrice Genevet Jean-Philippe Tetienne Evangelos Gatzogiannis Romain Blanchard Mikhail A. Kats Marlan O. Scully Institute for Quantum Studies and Department of Physics Texas A and M University College Station TX USA School of Engineering and Applied Sciences Harvard University Cambridge MA USA Center of Nanoscale Systems Harvard University Cambridge MA USA College of Engineering and Applied Science Princeton University Princeton NJ USA

A grating of nanogrooves is designed to form resonant nanocavities in a gold film. The large plasmonic enhancement of fourwave mixing makes such structures attractive for surface nonlinear optics.

ISBN: (纸本)9781557529107

A grating of nanogrooves is designed to form resonant nanocavities in a gold film. The large plasmonic enhancement of fourwave mixing makes such structures attractive for surface nonlinear optics.

关键词： Optical surface waves Surface waves Plasmons Metals Corrugated surfaces Surface treatment Gratings

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Deterministic chaos can act as a decoherence suppressor

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Physical Review B 2011年第21期84卷 214304-214304页

作者： Jing Zhang Yu-xi Liu Wei-Min Zhang Lian-Ao Wu Re-Bing Wu Tzyh-Jong Tarn Department of Automation Tsinghua University Beijing 100084 People's Republic of China Center for Quantum Information Science and Technology Tsinghua National Laboratory for Information Science and Technology Beijing 100084 People's Republic of China Institute of Microelectronics Tsinghua University Beijing 100084 People's Republic of China Department of Physics and Center for Quantum Information Science National Cheng Kung University Tainan 70101 Taiwan Department of Theoretical Physics and History of Science The Basque Country University (EHU/UPV) and IKERBASQUE Basque Foundation for Science E-48011 Bilbao Spain Department of Electrical and Systems Engineering Washington University St. Louis Missouri 63130 USA

We propose a strategy to suppress non-Markovian decoherence of a qubit by coupling the qubit to a deterministic chaotic setup with the broad power distribution in particular in the high-frequency domain. Although it is widely believed that chaos induces decoherence, we find, surprisingly, that the unitary dynamics induced by the chaotic setup can be helpful for the decoherence suppression. Compared with the existing decoherence control methods such as the usual dynamical decoupling, we do not need to impose high-frequency controls, because the high-frequency components in our method are generated by the chaotic setup, and the design of complex optimized control pulses used in the modified dynamical decoupling approaches is also not necessary. Using superconducting quantum circuits as an example, we demonstrate how to realize our general method. We find that various noises in a wide frequency domain, including low-frequency 1/f, high-frequency ohmic, subohmic, and superohmic noises, can be efficiently suppressed by coupling the qubit to a Duffing oscillator acting as the chaotic setup. Significantly, the decoherence time of the qubit is prolonged approximately 100 times in magnitude.

关键词： MARKOV spectrum SUPERCONDUCTORS OPTICS OHM'S law DIRECT currents

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Non-Markovian Relaxation of a Three-Level System: quantum Trajectory Approach

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Physical Review Letters 2010年第24期105卷 240403-240403页

作者： Jun Jing Ting Yu Center for Controlled Quantum Systems and Department of Physics and Engineering Physics Stevens Institute of Technology Hoboken New Jersey 07030 US

The non-Markovian dynamics of a three-level quantum system coupled to a bosonic environment is a difficult problem due to the lack of an exact dynamic equation such as a master equation. We present for the first time an exact quantum trajectory approach to a dissipative three-level model. We have established a convolutionless stochastic Schrödinger equation called the time-local quantum state diffusion (QSD) equation without any approximations, in particular, without Markov approximation. Our exact time-local QSD equation opens a new avenue for exploring quantum dynamics for a higher dimensional quantum system coupled to a non-Markovian environment.

关键词： quantum chemistry

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Geometric Correlations and Breakdown of Mesoscopic Universality in Spin Transport

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Physical Review Letters 2010年第24期105卷 246807-246807页

作者： İ. Adagideli Ph. Jacquod M. Scheid M. Duckheim D. Loss K. Richter Faculty of Engineering and Natural Sciences Sabanci University Orhanli-Tuzla 34956 Istanbul Turkey Physics Department University of Arizona 1118 E. 4th Street Tucson Arizona 85721 USA Institut für Theoretische Physik Universität Regensburg D-93040 Regensburg Germany Dahlem Center for Complex Quantum Systems Freie Universität Berlin 14195 Berlin Germany Department of Physics University of Basel CH-4056 Basel Switzerland

We construct a unified semiclassical theory of charge and spin transport in chaotic ballistic and disordered diffusive mesoscopic systems with spin-orbit interaction. Neglecting dynamic effects of spin-orbit interaction, we reproduce the random matrix theory results that the spin conductance fluctuates universally around zero average. Incorporating these effects into the theory, we show that geometric correlations generate finite average spin conductances, but that they do not affect the charge conductance to leading order. The theory, which is confirmed by numerical transport calculations, allows us to investigate the entire range from the weak to the previously unexplored strong spin-orbit regime, where the spin rotation time is shorter than the momentum relaxation time.

关键词： Random variables

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Transition from weak to strong measurements by nonlinear quantum feedback control

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Physical Review A 2010年第2期82卷 022101-022101页

作者： Jing Zhang Yu-xi Liu Re-Bing Wu Chun-Wen Li Tzyh-Jong Tarn Department of Automation Tsinghua University Beijing 100084 People’s Republic of China Center for Quantum Information Science and Technology Tsinghua National Laboratory for Information Science and Technology Beijing 100084 People’s Republic of China Department of Physics and National Center for Theoretical Sciences National Cheng Kung University Tainan 70101 Taiwan Institute of Microelectronics Tsinghua University Beijing 100084 People’s Republic of China Department of Electrical and Systems Engineering Washington University St. Louis Missouri 63130 USA

We find that feedback control may induce “pseudo”-nonlinear dynamics in a damped harmonic oscillator, whose centroid trajectory in the phase space behaves like a classical nonlinear system. Thus, similar to nonlinear amplifiers (e.g., rf-driven Josephson junctions), feedback control on the harmonic oscillator can induce nonlinear bifurcation, which can be used to amplify small signals and further to measure quantum states of qubits. Using the cavity QED and the circuit QED systems as examples, we show how to apply our method to measuring the states of two-level atoms and superconducting charge qubits.

关键词： Feedback control

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