中国物理B ›› 2007, Vol. 16 ›› Issue (5): 1344-1350.doi: 10.1088/1009-1963/16/5/030

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Quantum entanglement in the system of a moving V-type three-level atom interacting with the SU(1,1)-related coherent fields

胡要花, 方卯发, 廖湘萍   

  1. College of Physics and Information Science, Hunan Normal University, Changsha 410081, China
  • 收稿日期:2006-05-29 修回日期:2006-08-25 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) and by Hunan Provincial Natural Science Foundation of China (Grant No~06JJ4003).

Quantum entanglement in the system of a moving V-type three-level atom interacting with the SU(1,1)-related coherent fields

Hu Yao-Hua(胡要花), Fang Mao-Fa(方卯发)†, and Liao Xiang-Ping(廖湘萍)   

  1. College of Physics and Information Science, Hunan Normal University, Changsha 410081, China
  • Received:2006-05-29 Revised:2006-08-25 Online:2007-05-20 Published:2007-05-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No 10374025) and by Hunan Provincial Natural Science Foundation of China (Grant No~06JJ4003).

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摘要： In a system with a moving V-type three-level atom interacting with the SU(1,1)-related coherent fields, we investigate the entanglement between the moving three-level atom and the SU(1,1)-related coherent fields by using the quantum-reduced entropy, and that between the SU(1,1)-related coherent fields by using the quantum relative entropy of entanglement. It is shown that the two kinds of entanglement are dependent on the atomic motion and exhibit the periodic evolution with a period of 2π/p. The maximal atom--field qutrit entanglement state can be prepared, and the entanglement preservation of the SU(1,1)-related coherent fields can be realized in the interacting process via the appropriate selection of system parameters and interaction time.

关键词: three-level atoms, SU(1, 1)-related coherent fields, entanglement, reduced entropy, relative entropy

Abstract: In a system with a moving V-type three-level atom interacting with the SU(1,1)-related coherent fields, we investigate the entanglement between the moving three-level atom and the SU(1,1)-related coherent fields by using the quantum-reduced entropy, and that between the SU(1,1)-related coherent fields by using the quantum relative entropy of entanglement. It is shown that the two kinds of entanglement are dependent on the atomic motion and exhibit the periodic evolution with a period of $2\pi/p$. The maximal atom--field qutrit entanglement state can be prepared, and the entanglement preservation of the SU(1,1)-related coherent fields can be realized in the interacting process via the appropriate selection of system parameters and interaction time.

Key words: three-level atoms, SU(1,1)-related coherent fields, entanglement, reduced entropy, relative entropy

中图分类号:  (Entanglement and quantum nonlocality)

  • 03.65.Ud
03.67.Mn (Entanglement measures, witnesses, and other characterizations) 42.50.Dv (Quantum state engineering and measurements) 42.50.Pq (Cavity quantum electrodynamics; micromasers)