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自然科学进展 2006年第2期16卷 169-176页

作者：单欣孙献平罗军詹明生中国科学院武汉物理与数学研究所波谱与原子分子物理国家重点实验室武汉430071 中国科学院研究生院武汉430071

量子通信的安全性是基于Heisenberg测不准原理、单光子不可分割性和量子不可克隆定理,它遵从物理规律,是绝对安全的．近年来量子通信技术的迅速发展加快了量子通信的实用化进程．文中综述自由空间量子通信实验研究进展,简要介绍几种量... 详细信息

量子通信的安全性是基于Heisenberg测不准原理、单光子不可分割性和量子不可克隆定理,它遵从物理规律,是绝对安全的．近年来量子通信技术的迅速发展加快了量子通信的实用化进程．文中综述自由空间量子通信实验研究进展,简要介绍几种量子编码协议、不同类型单光子源的量子通信实验,说明全球量子通信的实现可能存在的问题与技术挑战,展望了自由空间量子通信的未来．

关键词：量子通信量子编码协议自由空间量子通信单光子源

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Squeezing via coupling of Bose–Einstein condensates in a double-well potential with a cavity light field

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Chinese Physics B 2008年第5期17卷 1601-1606页

作者：周鲁孔令波詹明生 State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics Wuhan Institute of Physics and Mathematics Chinese Academy of Sciences Center for Cold Atom Physics Chinese Academy of Sciences Graduate School of the Chinese Academy of Sciences State Key Laboratory of Precision Spectroscopy Department of Physics East China Normal University

Squeezing via the interaction between the cavity light field and the Bose Einstein Condensate （BEC） in a doublewell potential is considered within the context of the two-mode approximation. For the cavity light field initially in a coherent state, it is shown that by choosing appropriate parameters, quadrature squeezing of the cavity light field can be achieved and it exhibits periodic oscillation. We also study the case in which BEC is tuned to resonance by periodically modulating the trapping potentiaL and the quadrature squeezing of the cavity field exhibits periodic collapse and revival effect. Both analytic and numerical calculations are performed, and they are found to be in good agreement with each other. The result shows that the quantum statistical properties of the cavity light field can be manipulated by its coupling with the condensates in the double-well potential. On the other hand, dynamical properties of the condensates in the double-well potential will be reflected by the quadrature squeezing of the light field.

关键词： Bose-Einstein Condensate double-well potential squeezing

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