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Even and Odd Phase Coherent States Associated with the Pegg-Barnett Hermitian Phase Theory

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Chinese Physics letters 1996年第4期13卷 273-276页

作者： ZHU Jiu-yun kuang le-man Department of Physics Hu'nan Normal UniversityChangsha 410081

Even and odd phase coherent states associated with the Pegg-Barnett Hermitian phase theory are *** and odd coherent-state formalism of the Pegg-Barnett phase operator is given in terms of the projection operator in th... 详细信息

关键词： space. states. coherent

Broadcasting of Entanglement in Three-Particle Greenberger-Horne-Zeilinger State via Quantum Copying

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Chinese Physics letters 2000年第7期17卷 469-471页

作者： TONG Zhao-Yang kuang le-man Department of Physics Hu'nan Normal UniversityChangsha 410081

We introduce entanglement measures to describe entanglement in a three-particle system and apply it to studying broadcasting of entanglement in the three-particle Greenberger-Horne-Zeilinger (GHZ) state. The results show that the entanglement of the three-qubit GHZ state can be partially broadcasted with the help of local or non-local copying processes. It is found that non-local cloning is much more efficient than local cloning for the broadcasting of entanglement.

关键词： processes state local

Collapses and Revivals of Interferencing Intensity in Two Bose-Einstein Condensates with Josephson-Like Coupling

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Chinese Physics letters 1998年第10期15卷 703-705页

作者： kuang le-man ZENG Zhao-yang Department of Physics Hu’nan Normal UniversityChangsha 410081 Institute of Solid State Physics Chinese Academy of SciencesHefei 230031

An approximate analytic solution is present for a system of two Bose-Einstein condensates(BECs)with a Josephson-like *** the use of this approximate solution,it is shown that the existence of quantum collapses and revivals(QCRs)in the interferencing intensity of two *** is found that QCRs are seriously affected not only by interatomic collisions and the atomic tunneling between two BECs but also by initial states of the two BECs,so that one can manipulate QCRs through changing scattering lengths of atoms,atomic tunneling and initial states of BECs.

关键词： Josephson Einstein approximate

Atomic Tunnelling Dynamics of Two Squeezed Bose-Einstein COndensates

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Communications in Theoretical Physics 2003年第1期39卷 44-48页

作者： Li Jin-Hui kuang le-man Department of Physics Hunan Normal University Changsha 410081 China Department of Physics Chenzhou Teacher's Collega Chenzhou 423000 China

In this paper, tunnelling dynamics of squeezed Bose-Einstein condensates (BEC's) in the presence of the nonlinear self-interaction of each species, the interspecies nonlinear interaction, and the Josephson-like tunnelling interaction is investigated by using the second quantization approach. The influence of BEC squeezing on macroscopic quantum self-trapping (MQST) and quantum coherent atomic tunnelling is analyzed in detail. It is shown that the MQST and coherent atomic tunnelling between two squeezed BEC's can be manipulated through changing squeezing amplitude and squeezing phase of BEC squeezed states.

关键词：玻色-爱因斯坦凝聚态量子隧道动力学挤压态

Transferring and Bounding Single Photon in Waveguide Controlled by Quantum Node Based on Atomic Ensemble

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Communications in Theoretical Physics 2009年第9期52卷 500-506页

作者： LU Jing DONG Hui kuang le-man Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education and Depart- ment of Physics Hunan Normal University Changsha 410081 China Institute of Theoretical Physics Chinese Academy of Sciences Beijing 100080 China

We study the scattering process of photons confined in a one-dimensional optical waveguide by a laser controlled atomic ensemble. The investigation leads to an alternative setup of quantum node controlling the coherent transfer of single photon in such one dimensional continuum. To exactly solve the effective scattering equations by using the discrete coordinate approach, we simulate the linear waveguide as a coupled resonator array at the high energy limit. We generally calculate the transmission eoet^cients and its vanishing at resonance reflects the good controllability of our scheme. We also show that there exist two bound states to describe the localize photons around the cavity.

关键词： one-dimensional waveguide single photon bound states

Enhanced Deflection of Light Ray by Atomic Ensemble on Coherent Population Oscillation

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Communications in Theoretical Physics 2009年第1期51卷 139-144页

作者： LU Jing ZHOU Lan kuang le-man Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education and Department of Physics Hunan Normal University Changsha 410081 China

In recent experiments [e.g., Nature Physics 2 （2006） 332], the enhanced light deflection in an atomic ensemble due to inhomogeneous fields is demonstrated by the electromagneticaJly induced transparency （EIT） based mechanism. In this paper, we explore a different mechanism for the similar phenomenon of the enhanced light deflection. This mechanism is based on the coherent population oscillation, which leads to the hole burning in the absorption spectrum. The medium causing the deflection of probe light is an ensemble of two-level atoms manipulated by a strong controlled field on the two photon resonances. In the large detuning condition, the response of the medium to the pump field and signal field is obtained with steady state approximation. And it is found that after the probe field travels across the medium, the signal ray bends due to the spatial-dependent profile of the control beam.

关键词： coherent population oscillation atomic response large detuning

Preparation of GHZ States via Grover's Quantum Searching Algorithm

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Chinese Physics letters 2000年第6期17卷 410-412页

作者： ZENG Hao-Sheng kuang le-man Department of Physics Hunan Normal UniversityChangsha 410081

We propose an approach to prepare GHZ(Greenberger,Horne,Zeilinger)states of an arbitrary multi-particle system in terms of Grover's fast quantum searching *** approach can be used to produce other entangled states wit... 详细信息

关键词： states arbitrary searching

Excitation Spectrum of Three Dressed Bose-Einstein Condensates

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Chinese Physics letters 2000年第9期17卷 628-630页

作者： OU-YANG Zhong-Wen kuang le-man Department of Physics Hu’nan Normal UniversityChangsha 410081

We study quantum dynamics of three dressed Bose-Einstein condensates in a high-Q *** quasiparticle excitation spectrum of this system is found *** stability of the quasiparticle excitation is *** is shown that there e... 详细信息

关键词： spectrum. cavity. excitation

Periodical Oscillations of Supercurrent Fluctuation in Mesoscopic Josephson Junctions in Quantized Electromagnetic Fields

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Chinese Physics letters 1996年第5期13卷 359-361页

作者： kuang le-man WANG Yi-wen GE Mo-lin Theoretical Physics Division Nankai Instilute of MathematicsTianjin 300071 Department of Physics Hu'nan Normal UriiversityChangsha 410081

Supercurrent fluctuation of a mesoscopic Josephson jutiction(MJJ)in the presence of a de static voltage and a time-varying quantized electromagnetic field(QEMF)is *** is shown thm the fluctuation of supercurrent in the MJJ exhibits periodical oscillations with a periodicity shich depends upon the rate of the classical static external voltage and the frequency of the QEMF.

关键词： Josephson Electromagnetic Periodical