中国物理B ›› 2008, Vol. 17 ›› Issue (10): 3553-3558.doi: 10.1088/1674-1056/17/10/005

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Control of entanglement sudden death by Kerr medium

郑 强, 张小平, 任中洲   

  1. Department of Physics, Nanjing University, Nanjing 210093, China
  • 收稿日期:2008-05-13 修回日期:2008-06-20 出版日期:2008-10-20 发布日期:2008-10-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos 10535010 and 10775123), and the Research Foundation from Ministry of Education of China (contract No 20070284016).

Control of entanglement sudden death by Kerr medium

Zheng Qiang(郑强)†, Zhang Xiao-Ping(张小平), and Ren Zhong-Zhou(任中洲)   

  1. Department of Physics, Nanjing University, Nanjing 210093, China
  • Received:2008-05-13 Revised:2008-06-20 Online:2008-10-20 Published:2008-10-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos 10535010 and 10775123), and the Research Foundation from Ministry of Education of China (contract No 20070284016).

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摘要： The entanglement dynamics of system, where atoms A and B interact with single mode cavity fields a and b respectively, is studied. The interaction between atom A and cavity a may be described by using the typical Jaynes--Cummings model, while that between the atom B and cavity b filled with a Kerr medium is of a two-photon process. For a certain initial atom entanglement state, there is an entanglement sudden death effect between the two atoms. The Kerr medium in the cavity b can effectively prevent the undesirable entanglement sudden death from occurring. Also, from the viewpoint of the population dynamics, we discuss why the Kerr medium can do so.

关键词: Entanglement sudden death, Jaynes--Cummings model, Kerr

Abstract: The entanglement dynamics of system, where atoms A and B interact with single mode cavity fields a and b respectively, is studied. The interaction between atom A and cavity a may be described by using the typical Jaynes--Cummings model, while that between the atom B and cavity b filled with a Kerr medium is of a two-photon process. For a certain initial atom entanglement state, there is an entanglement sudden death effect between the two atoms. The Kerr medium in the cavity b can effectively prevent the undesirable entanglement sudden death from occurring. Also, from the viewpoint of the population dynamics, we discuss why the Kerr medium can do so.

Key words: Entanglement sudden death, Jaynes--Cummings model, Kerr

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

  • 42.50.Dv
03.65.Ud (Entanglement and quantum nonlocality) 42.50.Hz (Strong-field excitation of optical transitions in quantum systems; multiphoton processes; dynamic Stark shift) 42.65.Hw (Phase conjugation; photorefractive and Kerr effects)