中国物理B ›› 2009, Vol. 18 ›› Issue (4): 1517-1527.doi: 10.1088/1674-1056/18/4/038

• CLASSICAL AREAS OF PHENOMENOLOGY • 上一篇    下一篇

Entropy squeezing for a two-level atom in two-mode Raman coupled model with intrinsic decoherence

张剑, 邵彬, 邹健   

  1. Department of Physics, School of Science, Beijing Institute of Technology, Beijing 100081, China
  • 收稿日期:2008-07-10 修回日期:2008-08-14 出版日期:2009-04-20 发布日期:2009-04-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No 10374007).

Entropy squeezing for a two-level atom in two-mode Raman coupled model with intrinsic decoherence

Zhang Jian(张剑)† , Shao Bin(邵彬), and Zou Jian(邹健)   

  1. Department of Physics, School of Science, Beijing Institute of Technology, Beijing 100081, China
  • Received:2008-07-10 Revised:2008-08-14 Online:2009-04-20 Published:2009-04-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No 10374007).

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摘要： In this paper, we investigate the entropy squeezing for a two-level atom interacting with two quantized fields through Raman coupling. We obtain the dynamical evolution of the total system under the influence of intrinsic decoherence when the two quantized fields are prepared in a two-mode squeezing vacuum state initially. The effects of the field squeezing factor, the two-level atomic transition frequency, the second field frequency and the intrinsic decoherence on the entropy squeezing are discussed. Without intrinsic decoherence, the increase of field squeezing factor can break the entropy squeezing. The two-level atomic transition frequency changes only the period of oscillation but not the strength of entropy squeezing. The influence of the second field frequency is complicated. With the intrinsic decoherence taken into consideration, the results show that the stronger the intrinsic decoherence is, the more quickly the entropy squeezing will disappear. The increase of the atomic transition frequency can hasten the disappearance of entropy squeezing.

Abstract: In this paper, we investigate the entropy squeezing for a two-level atom interacting with two quantized fields through Raman coupling. We obtain the dynamical evolution of the total system under the influence of intrinsic decoherence when the two quantized fields are prepared in a two-mode squeezing vacuum state initially. The effects of the field squeezing factor, the two-level atomic transition frequency, the second field frequency and the intrinsic decoherence on the entropy squeezing are discussed. Without intrinsic decoherence, the increase of field squeezing factor can break the entropy squeezing. The two-level atomic transition frequency changes only the period of oscillation but not the strength of entropy squeezing. The influence of the second field frequency is complicated. With the intrinsic decoherence taken into consideration, the results show that the stronger the intrinsic decoherence is, the more quickly the entropy squeezing will disappear. The increase of the atomic transition frequency can hasten the disappearance of entropy squeezing.

Key words: entropy squeezing, intrinsic decoherence, two-mode Raman coupled model

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

  • 42.50.Dv
03.67.-a (Quantum information) 42.50.Gy (Effects of atomic coherence on propagation, absorption, and Amplification of light; electromagnetically induced transparency and Absorption)