中国物理B ›› 2007, Vol. 16 ›› Issue (5): 1357-1363.doi: 10.1088/1009-1963/16/5/032

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Stationary entanglement between two spatially separated atoms driven by a coherent laser field

方卯发1, 郑小娟1, 廖湘萍2, 蔡建武2   

  1. (1)Department of Physics, Hunan Normal University,Changsha 410081, China; (2)Department of Physics, Hunan Normal University,Changsha 410081, China;Department of Physics and Electronics, Zhuzhou Teacher' College, Zhuzhou 412007, China;Department of Physics, Hunan Industrial University, Zhuzhou 412000, China
  • 收稿日期:2006-09-06 修回日期:2006-10-15 出版日期:2007-05-20 发布日期:2007-05-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No 10374025), Hunan Provincial Natural Science Foundation, China (Grant No 06JJ4003 and Grant No 06JJ2014) and by the Young Scientific Research Foundation of Hunan Provincial Edu

Stationary entanglement between two spatially separated atoms driven by a coherent laser field

Liao Xiang-Ping(廖湘萍)a)b)c), Fang Mao-Fa(方卯发)a)†, Zheng Xiao-Juan(郑小娟)a), and Cai Jian-Wu(蔡建武)a)b)c)   

  1. a Department of Physics, Hunan Normal University, Changsha 410081, China; b Department of Physics and Electronics, Zhuzhou Teacher' College, Zhuzhou 412007, Chinac Department of Physics, Hunan Industrial University, Zhuzhou 412000, China
  • Received:2006-09-06 Revised:2006-10-15 Online:2007-05-20 Published:2007-05-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No 10374025), Hunan Provincial Natural Science Foundation, China (Grant No 06JJ4003 and Grant No 06JJ2014) and by the Young Scientific Research Foundation of Hunan Provincial Edu

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摘要： This paper studies quantum entanglement between two spatially separated atoms driven by a coherent laser field in the dissipative process of spontaneous emission. It is shown that the entanglement strongly depends on the detuning of the laser frequency from atomic transition frequency, the interatomic separation and the Rabi frequency of the coherent laser field. A considerable amount of steady state entanglement can be obtained near Δ=-α (i.e., the dipole--dipole interaction and the detuning cancel out mutually) for small atomic separation and large Rabi frequency of the coherent laser field.

关键词: the coherent laser field, spontaneous emission, concurrence

Abstract: This paper studies quantum entanglement between two spatially separated atoms driven by a coherent laser field in the dissipative process of spontaneous emission. It is shown that the entanglement strongly depends on the detuning of the laser frequency from atomic transition frequency, the interatomic separation and the Rabi frequency of the coherent laser field. A considerable amount of steady state entanglement can be obtained near $\varDelta=-\alpha$ (i.e., the dipole--dipole interaction and the detuning cancel out mutually) for small atomic separation and large Rabi frequency of the coherent laser field.

Key words: the coherent laser field, spontaneous emission, concurrence

中图分类号:  (Quantum state engineering and measurements)

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