中国物理B ›› 2008, Vol. 17 ›› Issue (6): 2137-2142.doi: 10.1088/1674-1056/17/6/032

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The entanglement of two dipole--dipole coupled atoms interacting with a thermal field via a two-photon process

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:2007-07-15 修回日期:2007-12-30 出版日期:2008-06-20 发布日期:2008-06-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No 10374025), Hunan Provincial Natural Science Foundation (Grant Nos 06JJ4003 and 06JJ2014) and the Young Scientific Research Foundation of Hunan Provincial Education Department

The entanglement of two dipole--dipole coupled atoms interacting with a thermal field via a two-photon process

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

  1. a Department of Physics, Hunan Normal University, Changsha 410081, China; b Department of Physics and Electronics, Zhuzhou Teacher' College, ZhuZhou 412007, China; c Department of Physics, Hunan Industrial University, Zhuzhou 412000, China
  • Received:2007-07-15 Revised:2007-12-30 Online:2008-06-20 Published:2008-06-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No 10374025), Hunan Provincial Natural Science Foundation (Grant Nos 06JJ4003 and 06JJ2014) and the Young Scientific Research Foundation of Hunan Provincial Education Department

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摘要： This paper studies entanglement between two dipole--dipole coupled atoms interacting with a thermal field via a two-photon process. It shows that the entanglement is dependent on the mean photon number of the thermal field and the dipole--dipole interaction. The results also show that the atom--atom entanglement through the two-photon process is larger than that through the one-photon process and a remarkable amount of entanglement between the atoms still remains at certain times even for a very highly noisy thermal field.

关键词: entanglement, two-photon process, dipole--dipole interaction, thermal field

Abstract: This paper studies entanglement between two dipole--dipole coupled atoms interacting with a thermal field via a two-photon process. It shows that the entanglement is dependent on the mean photon number of the thermal field and the dipole--dipole interaction. The results also show that the atom--atom entanglement through the two-photon process is larger than that through the one-photon process and a remarkable amount of entanglement between the atoms still remains at certain times even for a very highly noisy thermal field.

Key words: entanglement, two-photon process, dipole--dipole interaction, thermal field

中图分类号:  (Entanglement and quantum nonlocality)

  • 03.65.Ud
32.80.Wr (Other multiphoton processes) 42.50.Dv (Quantum state engineering and measurements)