中国物理B ›› 2005, Vol. 14 ›› Issue (10): 2009-2013.doi: 10.1088/1009-1963/14/10/015

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Quantum entanglement in the system of two two-level atoms interacting with a single-mode vacuum field

方卯发1, 曾可2   

  1. (1)Department of Physics, Hunan Normal University, Changsha 410081, China; (2)Department of Physics, Hunan Normal University, Changsha 410081, China;Department of Applied Physics and Electronic Technology, Changsha University, Changsha 410003, China
  • 收稿日期:2005-04-25 修回日期:2005-06-08 出版日期:2005-10-20 发布日期:2005-10-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No 10374025).

Quantum entanglement in the system of two two-level atoms interacting with a single-mode vacuum field

Zeng Ke (曾可)ab, Fang Mao-Fa (方卯发)a   

  1. a Department of Physics, Hunan Normal University, Changsha 410081, China; b Department of Applied Physics and Electronic Technology, Changsha University, Changsha 410003, China
  • Received:2005-04-25 Revised:2005-06-08 Online:2005-10-20 Published:2005-10-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No 10374025).

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摘要： The entanglement properties of the system of two two-level atoms interacting with a single-mode vacuum field are explored. The quantum entanglement between two two-level atoms and a single-mode vacuum field is investigated by using the quantum reduced entropy; the quantum entanglement between two two-level atoms, and that between a single two-level atom and a single-mode vacuum field are studied in terms of the quantum relative entropy. The influences of the atomic dipole--dipole interaction on the quantum entanglement of the system are also discussed. Our results show that three entangled states of two atoms--field, atom--atom, and atom--field can be prepared via two two-level atoms interacting with a single-mode vacuum field.

关键词: quantum entanglement, single mode vacuum field, reduced entropy, relative entropy

Abstract: The entanglement properties of the system of two two-level atoms interacting with a single-mode vacuum field are explored. The quantum entanglement between two two-level atoms and a single-mode vacuum field is investigated by using the quantum reduced entropy; the quantum entanglement between two two-level atoms, and that between a single two-level atom and a single-mode vacuum field are studied in terms of the quantum relative entropy. The influences of the atomic dipole--dipole interaction on the quantum entanglement of the system are also discussed. Our results show that three entangled states of two atoms--field, atom--atom, and atom--field can be prepared via two two-level atoms interacting with a single-mode vacuum field.

Key words: quantum entanglement, single mode vacuum field, reduced entropy, relative entropy

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

  • 42.50.Dv
42.50.Ct (Quantum description of interaction of light and matter; related experiments) 32.80.-t (Photoionization and excitation)