中国物理B ›› 2005, Vol. 14 ›› Issue (5): 980-984.doi: 10.1088/1009-1963/14/5/021

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Evolution of field entropy and entanglement in the intensity-dependent two-mode Jaynes-Cummings model　　　　

高云峰1, 王继锁2, 冯健3   

  1. (1)College of Educational Technology and Massmedium, Liaocheng University, Liaocheng 252059, China; (2)Institute of Optical Communication, Liaocheng University, Liaocheng, 252059, Chin; (3)Institute of Optical Communication, Liaocheng University, Liaocheng, 252059, China; State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences，Wuhan, 430071, China
  • 收稿日期:2004-08-31 修回日期:2004-11-29 出版日期:2005-05-19 发布日期:2005-05-19
  • 基金资助:
    Project supported by the Natural Science Foundation of Shandong Province (Grant No.Y2004A09),China.

Evolution of field entropy and entanglement in the intensity-dependent two-mode Jaynes-Cummings model

Gao Yun-Feng (高云峰)a, Feng Jian (冯健)bc, Wang Ji-Suo (王继锁)b   

  1. a College of Educational Technology and Massmedium, Liaocheng University, Liaocheng 252059, China; b State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences，Wuhan 430071, China; c Institute of Optical Communication, Liaocheng University, Liaocheng 252059, China
  • Received:2004-08-31 Revised:2004-11-29 Online:2005-05-19 Published:2005-05-19
  • Supported by:
    Project supported by the Natural Science Foundation of Shandong Province (Grant No.Y2004A09),China.

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摘要： The evolution of the entanglement degree of two-mode fields and atom with the intensity-dependent coupling is investigated by using von Neumann entropy. The results for the initial fields in both coherent states and two-mode squeezed vacuum state are calculated. The influence of the field intensity on the entropy is discussed. It is found that the field and atom are in maximum entanglement but go with periodic pulse disentanglement completely under the condition of strong initial field.

关键词: degree of entanglement, von Neumann entropy, two-mode Jaynes-Cummings model, intensity-dependent coupling

Abstract: The evolution of the entanglement degree of two-mode fields and atom with the intensity-dependent coupling is investigated by using von Neumann entropy. The results for the initial fields in both coherent states and two-mode squeezed vacuum state are calculated. The influence of the field intensity on the entropy is discussed. It is found that the field and atom are in maximum entanglement but go with periodic pulse disentanglement completely under the condition of strong initial field.

Key words: degree of entanglement, von Neumann entropy, two-mode Jaynes-Cummings model, intensity-dependent coupling

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  • 4250