原子-光场耦合的线性调制对原子纠缠的影响

J4 ›› 2014, Vol. 31 ›› Issue (6): 715-719.

原子-光场耦合的线性调制对原子纠缠的影响

韩运侠,胡要花

洛阳师范学院物理与电子信息学院，河南洛阳 471022

收稿日期:2014-07-14 修回日期:2014-08-22 出版日期:2014-11-28 发布日期:2014-11-17
通讯作者: 韩运侠（1961—）河南伊川人，教授，主要从事高等教育和光学研究。 E-mail:hanyunxia999@163.com; huyaohua1@sina.com
基金资助:
NSFC-河南人才培养联合基金 (U1204616)、河南省教育厅基础研究计划（13A140798）

Effect of linear modulation of the atom-field couplings on atom entanglement

HAN Yun-Xia, HU Yao-Hua

Physics and Electronic Information College, Luoyang Normal University, Luoyang 471022, China

Received:2014-07-14 Revised:2014-08-22 Published:2014-11-28 Online:2014-11-17

摘要/Abstract

摘要： 研究由两个相同的二能级原子和一个单模量子化腔场组成的系统中，两原子初始处于纠缠态时，原子与光场的耦合系数随时间线性变化对纠缠的影响。结果表明：初始纠缠的保持时间与耦合系数的线性调制密切相关。较耦合系数为常数的情形而言，当耦合系数的变化比较平缓时，耦合系数线性调制下的初始纠缠消失的时间被大大延迟；当耦合系数的变化很急促时，两原子的初始纠缠将很快消失。

关键词: 量子光学, 量子纠缠, 原子-光场耦合, 线性调控

Abstract: Considering a model containing two two-level atoms and a single-mode cavity, we have studied the effects of the time-dependent atom-field couplings on entanglement between the two atoms when the two atoms are initially in an entangled state. The results show that, the time of initial entanglement preservation is very sensitive to the linear modulation of the atom-field couplings. Compared to the case of the constant coupling model, when the atom-field couplings change smoothly, the disappearance of the initial entanglement is delayed due to the linear modulation. However, the disappearance of the initial entanglement can be hastened for the sudden jump in the coupling.

Key words: quantum optics, quantum entanglement, atom-field coupling, linear modulation

中图分类号:

O431.2

韩运侠胡要花. 原子-光场耦合的线性调制对原子纠缠的影响[J]. J4, 2014, 31(6): 715-719.

HAN Yun-Xia, HU Yao-Hua. Effect of linear modulation of the atom-field couplings on atom entanglement[J]. J4, 2014, 31(6): 715-719.

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