J4 ›› 2011, Vol. 28 ›› Issue (6): 699-704.

• 量子光学 • 上一篇    下一篇

Kerr介质中耦合全同V型三能级原子与真空场作用场熵的量子性质

李可,令维军,王志坚   

  1. 天水师范学院物理系,  甘肃 天水, 741000
  • 收稿日期:2010-10-19 修回日期:2011-08-08 出版日期:2011-11-28 发布日期:2011-11-14
  • 通讯作者: 李可(1971-)甘肃人,硕士,讲师,从事量子光学理论方面的研究。 E-mail:ligasaen@163.com
  • 基金资助:

    国家自然科学基金(60878020)和天水师范学院青蓝工程支助课题

Entropy properties of  coupled identical V-type three-level atoms interacting with vacuum field in cavity filled with Kerr-like medium

LI Ke, LING Wei-jun, WANG Zhi-jian   

  1. Department of Physics, Tianshui Normal University, Tianshui 741001, China
  • Received:2010-10-19 Revised:2011-08-08 Published:2011-11-28 Online:2011-11-14

摘要:

利用全量子理论,研究了真空场与耦合全同V型三能级原子相互作用过程中场熵的演化特性。讨论了系统初始状态、原子间偶极相互作用和Kerr介质的三阶非线性系数对场熵演化特性的影响。 数值计算结果表明:初始时刻原子基态和激发态处于合适的叠加态时,场熵呈现出周期性振荡,其振荡频率和幅度与原子间的耦合常数、Kerr介质的三阶非线性系数有很大关系。由此可见,场熵敏感于系统初始时刻原子的状态。

关键词: 量子光学, 熵, 耦合V型三能级原子, Kerr介质

Abstract:

The entropy properties of the field in the system of coupled identical V-type three-level atoms interacting with vacuum field in cavity filled with Kerr-like medium are studied by means of quantum theory. The time evolution of the entropy of the field via the initial state of the atomic system、coupling coefficient between the atoms and the Kerr coefficient are discussed. Numerical calculation results show: When the ground state and the excited state of the atoms are in appropriate superpositions state, the entropy of the field is behaving periodic oscillation. The oscillate frequency and amplitude are depending on the coupling constant between atoms and the third-order nonlinear coefficient of Kerr-like medium. Therefore, the entropy of the field is very sensitive to the atomic initial state.

Key words: quantum optics, entropy, coupled V-type three-level atoms, kerr-like medium

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