中国物理B ›› 2003, Vol. 12 ›› Issue (9): 971-976.doi: 10.1088/1009-1963/12/9/308

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Entangled states in the two-mode coherent fields interacting with a two-level atom

方卯发1, 刘小娟2   

  1. (1)Department of Physics, Hunan Normal University, Changsha 410081, China; Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China; (2)Department of Physics, Hunan Normal University, Changsha 410081, China; Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China; Department of Physics, Xiangtan Normal College, Xiangtan 411202, China
  • 收稿日期:2003-01-24 修回日期:2003-04-21 出版日期:2003-09-16 发布日期:2005-03-16
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No 19874020), the Natural Science Foundation of Hunan Province, China (Grant No 01JJY3030), and the Scientific Research Fund from the Education Bureau of Hunan Province, China(Grant No 01C260).

Entangled states in the two-mode coherent fields interacting with a two-level atom

Liu Xiao-Juan (刘小娟)abc, Fang Mao-Fa (方卯发)ab    

  1. a Department of Physics, Hunan Normal University, Changsha 410081, China; b Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, Chinac Department of Physics, Xiangtan Normal College, Xiangtan 411202, China
  • Received:2003-01-24 Revised:2003-04-21 Online:2003-09-16 Published:2005-03-16
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No 19874020), the Natural Science Foundation of Hunan Province, China (Grant No 01JJY3030), and the Scientific Research Fund from the Education Bureau of Hunan Province, China(Grant No 01C260).

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摘要： We investigate the entanglement properties of the two-mode coherent fields interacting with a two-level atom via the two-photon transition. We discuss the quantum entanglement between the two-mode coherent fields and the two-level atom by using the quantum reduced entropy and that between the two-mode coherent fields by using the quantum relative entropy. We also examine the influences of the initial states of the atom and the two-mode coherent fields on the quantum entanglement of the system. Our results show that three types of entangled states can be prepared via the two-mode coherent fields interacting with a two-level atom and choosing appropriately the initial-state parameters of the system.

Abstract: We investigate the entanglement properties of the two-mode coherent fields interacting with a two-level atom via the two-photon transition. We discuss the quantum entanglement between the two-mode coherent fields and the two-level atom by using the quantum reduced entropy and that between the two-mode coherent fields by using the quantum relative entropy. We also examine the influences of the initial states of the atom and the two-mode coherent fields on the quantum entanglement of the system. Our results show that three types of entangled states can be prepared via the two-mode coherent fields interacting with a two-level atom and choosing appropriately the initial-state parameters of the system.

Key words: two-mode coherent fields, quantum entanglement, reduced entropy, relative entropy

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

  • 42.50.Dv
32.80.Qk (Coherent control of atomic interactions with photons) 03.65.Ud (Entanglement and quantum nonlocality) 03.67.Mn (Entanglement measures, witnesses, and other characterizations)