中国物理B ›› 2003, Vol. 12 ›› Issue (1): 45-50.doi: 10.1088/1009-1963/12/1/308

• CLASSICAL AREAS OF PHENOMENOLOGY • 上一篇    下一篇

The effect of degenerate atomic levels on the field state dissipation in two-photon Jaynes--Cummings model

周 玲, 宋鹤山, 李 崇, 郭彦青   

  1. Department of Physics, Dalian University of Technology, Dalian 116024, China
  • 收稿日期:2002-03-19 修回日期:2002-09-10 出版日期:2003-01-20 发布日期:2003-01-20

The effect of degenerate atomic levels on the field state dissipation in two-photon Jaynes--Cummings model

Zhou Ling (周 玲), Song He-Shan (宋鹤山), Li Chong (李 崇), Guo Yan-Qing (郭彦青)   

  1. Department of Physics, Dalian University of Technology, Dalian 116024, China
  • Received:2002-03-19 Revised:2002-09-10 Online:2003-01-20 Published:2003-01-20

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摘要： The dissipation of the field in the two-photon Jaynes--Cummings model (JCM) with degenerate atomic levels was studied. The initial degenerate atomic state affects the field coherence loss. When the degenerate atom is initially in an equal probability superposition state, the field coherence loss is smallest. It is found that the degeneracy of the atomic level increases the period of entanglement between the atom and the field. When the degeneracy was considered, the coherence properties of the field could be affected by the reservoir qualitatively, if a nonlinear two-photon process is involved. This is different from the dissipation of one-photon JCM with degenerate atomic levels.

Abstract: The dissipation of the field in the two-photon Jaynes--Cummings model (JCM) with degenerate atomic levels was studied. The initial degenerate atomic state affects the field coherence loss. When the degenerate atom is initially in an equal probability superposition state, the field coherence loss is smallest. It is found that the degeneracy of the atomic level increases the period of entanglement between the atom and the field. When the degeneracy was considered, the coherence properties of the field could be affected by the reservoir qualitatively, if a nonlinear two-photon process is involved. This is different from the dissipation of one-photon JCM with degenerate atomic levels.

Key words: two-photon JCM, degenerate atomic levels, field dissipation

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

  • 42.50.Dv
42.50.Pq (Cavity quantum electrodynamics; micromasers) 32.80.-t (Photoionization and excitation)