中国物理B ›› 2006, Vol. 15 ›› Issue (2): 353-364.doi: 10.1088/1009-1963/15/2/021

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Three-body entanglement induced by spontaneous emission in a three two-level atoms system

方卯发1, 郑小娟1, 廖湘萍2, 蔡建武2   

  1. (1)College of Physics and Information Science, Hunan Normal University, Changsha 410081, China; (2)College of Physics and Information Science, Hunan Normal University, Changsha 410081, China;Department of Physics and Electronics, Zhuzhou Teacher College, Zhuzhou 412007, China
  • 收稿日期:2005-07-17 修回日期:2005-09-02 出版日期:2006-02-20 发布日期:2006-02-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No 10374025) and the Young Scientific Research Foundation of Hunan Provincial Education Department (Grand No 04B070).

Three-body entanglement induced by spontaneous emission in a three two-level atoms system

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

  1. a College of Physics and Information Science, Hunan Normal University, Changsha 410081, China; b Department of Physics and Electronics, Zhuzhou Teacher College, Zhuzhou 412007, China
  • Received:2005-07-17 Revised:2005-09-02 Online:2006-02-20 Published:2006-02-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No 10374025) and the Young Scientific Research Foundation of Hunan Provincial Education Department (Grand No 04B070).

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摘要： We study three-body entanglement induced by spontaneous emission in a three two-level atoms system by using the entanglement tensor approach. The results show that the amount of entanglement is strongly dependent on the initial state of the system and the species of atoms. The three-body entanglement is the result of the coherent superposition of the two-body entanglements. The larger the two-body entanglement is, the stronger the three-body entanglement is. On the other hand, if there exists a great difference in three two-body entanglement measures, the three-body entanglement is very weak. We also find that the maximum of the two-body entanglement obtained with nonidentical atoms is greater than that obtained with identical atoms via adjusting the difference in atomic frequency.

关键词: spontaneous emission, entanglement measures

Abstract: We study three-body entanglement induced by spontaneous emission in a three two-level atoms system by using the entanglement tensor approach. The results show that the amount of entanglement is strongly dependent on the initial state of the system and the species of atoms. The three-body entanglement is the result of the coherent superposition of the two-body entanglements. The larger the two-body entanglement is, the stronger the three-body entanglement is. On the other hand, if there exists a great difference in three two-body entanglement measures, the three-body entanglement is very weak. We also find that the maximum of the two-body entanglement obtained with nonidentical atoms is greater than that obtained with identical atoms via adjusting the difference in atomic frequency.

Key words: spontaneous emission, entanglement measures

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

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