腔耦合双J-C模型中原子纠缠的猝灭和猝生

J4 ›› 2011, Vol. 28 ›› Issue (1): 65-72.

腔耦合双J-C模型中原子纠缠的猝灭和猝生

王忠纯, 沈法华, 刘成林

盐城师范学院物理科学与电子技术学院, 江苏盐城 224002

收稿日期:2010-04-20 修回日期:2010-05-18 出版日期:2011-01-28 发布日期:2011-01-14
通讯作者: 王忠纯(1954-), 江苏东台市人, 教授, 主要从事光学和量子光学的教学和研究工作。 E-mail:wz_chun@yahoo.com.cn
基金资助:
江苏省自然科学基金(BK2008199)资助项目

Sudden death and sudden birth of atomic entanglement in double Jaynes-Cummings model composed of two coupled cavities

WANG Zhong-Chun, SHEN Fa-Hua, LIU Cheng-Lin

School of Physics and Electronics, Yancheng Teachers University, Yancheng 224002, China

Received:2010-04-20 Revised:2010-05-18 Published:2011-01-28 Online:2011-01-14

摘要/Abstract

摘要：

研究了腔间有耦合的双J-C模型中原子纠缠的动力学, 分析了腔间耦合系数A和原子的初态对原子纠缠的猝灭(ESD)和猝生(ESB)的影响. 通过对原子间共生纠缠度的数值分析发现, 当原子初态为第一类类Bell态时, 不会出现ESD和ESB, 腔间的耦合可使原子的纠缠加大, 并能使初态为分离态的原子产生纠缠. 当原子初态为第二类类Bell态时, A的大小可改变出现ESD与ESB的时间间隔, 或决定是否出现ESD, 但腔间的耦合不能使初态不纠缠的原子产生纠缠.

关键词: 量子光学, 耦合谐振腔, 双J-C模型, 共生纠缠度, 纠缠的猝灭, 纠缠的猝生

Abstract:

The atomic entanglement dynamics in the double Jaynes-Cummings model composed of two coupled cavities. Effect of the cavity-cavity coupling constant A and the atomic initial states on entanglement sudden death(ESD) and entanglement sudden birth(ESB) is analysed. By studying the atomic concurrence, it was shown that when the atomic initial states are the first kind, ESD and Bell-like states, ESD and ESB doesn’t appear, coupling of the cavities can increase the atomic entanglement and can occur entanglement even the initial states are disentangled. When the atomic initial states are Bell-like states of the second kind, the time intervals between the ESD and ESB, and whether the ESD occurs or not are controlled by the coupling constant A. The atomic entanglement can’t be produced by the coupling between the cavities when the atomic initial states are disentangled and in the second kind Bell-like states.

Key words: quantum optics, coupled cavities, double Jaynes-Cummings model, concurrence, entanglement sudden death, entanglement sudden birth

中图分类号:

O431.2

王忠纯沈法华刘成林. 腔耦合双J-C模型中原子纠缠的猝灭和猝生[J]. J4, 2011, 28(1): 65-72.

WANG Zhong-Chun, SHEN Fa-Hua, LIU Cheng-Lin. Sudden death and sudden birth of atomic entanglement in double Jaynes-Cummings model composed of two coupled cavities[J]. J4, 2011, 28(1): 65-72.

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