中国物理B ›› 2006, Vol. 15 ›› Issue (9): 2012-2017.doi: 10.1088/1009-1963/15/9/019

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Entanglement in a system of two two-level atoms interacting with a single-mode field

靳丽娟1, 方卯发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
  • 收稿日期:2005-06-30 修回日期:2006-05-22 出版日期:2006-09-20 发布日期:2006-09-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No 10374025).

Entanglement in a system of two two-level atoms interacting with a single-mode field

Jin Li-Juan(靳丽娟) and Fang Mao-Fa(方卯发)†   

  1. College of Physics and Information Science,Hunan Normal University, Changsha 410081, China
  • Received:2005-06-30 Revised:2006-05-22 Online:2006-09-20 Published:2006-09-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No 10374025).

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摘要： We investigate the entanglement in a system of two coupling atoms interacting with a single-mode field by means of quantum information entropy theory. The quantum entanglement between the two atoms and the coherent field is discussed by using the quantum reduced entropy, and the entanglement between the two coupling atoms is also investigated by using the quantum relative entropy. In addition, the influences of the atomic dipole--dipole interaction intensity and the average photon number of the coherent field on the degree of the entanglement is examined. The results show that the evolution of the degree of entanglement between the two atoms and the field is just opposite to that of the degree of entanglement between the two atoms. And the properties of the quantum entanglement in the system rely on the atomic dipole--dipole interaction and the average photon number of the coherent field.

关键词: quantum entanglement, reduced entropy, relative entropy

Abstract: We investigate the entanglement in a system of two coupling atoms interacting with a single-mode field by means of quantum information entropy theory. The quantum entanglement between the two atoms and the coherent field is discussed by using the quantum reduced entropy, and the entanglement between the two coupling atoms is also investigated by using the quantum relative entropy. In addition, the influences of the atomic dipole--dipole interaction intensity and the average photon number of the coherent field on the degree of the entanglement is examined. The results show that the evolution of the degree of entanglement between the two atoms and the field is just opposite to that of the degree of entanglement between the two atoms. And the properties of the quantum entanglement in the system rely on the atomic dipole--dipole interaction and the average photon number of the coherent field.

Key words: quantum entanglement, reduced entropy, relative entropy

中图分类号:  (Image forming and processing)

  • 42.30.Va
42.25.Kb (Coherence) 42.79.Ag (Apertures, collimators) 42.50.Lc (Quantum fluctuations, quantum noise, and quantum jumps)