中国物理B ›› 2003, Vol. 12 ›› Issue (3): 294-299.doi: 10.1088/1009-1963/12/3/308

• CLASSICAL AREAS OF PHENOMENOLOGY • 上一篇    下一篇

Entropy squeezing for a two-level atom in the Jaynes－Cummings model with an intensity-depend coupling

李春先, 方卯发   

  1. Department of Physics, Hunan Normal University, Changsha 410081, China
  • 收稿日期:2002-08-26 修回日期:2002-12-02 出版日期:2005-03-16 发布日期:2005-03-16
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No 19874020), by the Natural Science Foundation of Hunan Province, China (Grant No 01JJY3030) and by the Ministry of Education, China.

Entropy squeezing for a two-level atom in the Jaynes－Cummings model with an intensity-depend coupling

Li Chun-Xian (李春先), Fang Mao-Fa (方卯发)   

  1. Department of Physics, Hunan Normal University, Changsha 410081, China
  • Received:2002-08-26 Revised:2002-12-02 Online:2005-03-16 Published:2005-03-16
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No 19874020), by the Natural Science Foundation of Hunan Province, China (Grant No 01JJY3030) and by the Ministry of Education, China.

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摘要： We study the squeezing for a two-level atom in the Jaynes－Cummings model with intensity-dependent coupling using quantum information entropy, and examine the influences of the initial state of the system on the squeezed component number and direction of the information entropy squeezing. Our results show that, the squeezed component number depends on the atomic initial distribution angle, while the squeezed direction is determined by both the phases of the atom and the field for the information entropy squeezing. Quantum information entropy is shown to be a remarkable precision measure for atomic squeezing.

Abstract: We study the squeezing for a two-level atom in the Jaynes－Cummings model with intensity-dependent coupling using quantum information entropy, and examine the influences of the initial state of the system on the squeezed component number and direction of the information entropy squeezing. Our results show that, the squeezed component number depends on the atomic initial distribution angle, while the squeezed direction is determined by both the phases of the atom and the field for the information entropy squeezing. Quantum information entropy is shown to be a remarkable precision measure for atomic squeezing.

Key words: information entropy squeezing, variance squeezing, information entropy uncertainty relation

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

  • 42.50.Dv
03.67.-a (Quantum information)