中国物理B ›› 2006, Vol. 15 ›› Issue (12): 2953-2958.doi: 10.1088/1009-1963/15/12/031

• CLASSICAL AREAS OF PHENOMENOLOGY • 上一篇    下一篇

Entanglement concentration for multi-atom GHZ class state via cavity QED

姜春蕾, 方卯发, 郑小娟   

  1. College of Physics and Information Science,Hunan Normal University, Changsha 410081, China
  • 收稿日期:2006-03-28 修回日期:2006-07-10 出版日期:2006-12-20 发布日期:2006-12-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No 10374025).

Entanglement concentration for multi-atom GHZ class state via cavity QED

Jiang Chun-Lei(姜春蕾), Fang Mao-Fa(方卯发)†, and Zheng Xiao-Juan(郑小娟)   

  1. College of Physics and Information Science,Hunan Normal University, Changsha 410081, China
  • Received:2006-03-28 Revised:2006-07-10 Online:2006-12-20 Published:2006-12-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No 10374025).

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摘要： In this paper, we propose a physical scheme to concentrate non-maximally entangled atomic pure states by using atomic collision in a far-off-resonant cavity. The most distinctive advantage of our scheme is that the non-maximally entangled atoms may be far from or near each other and their degree of entanglement can be maximally amplified. The photon-number-dependent parts in the effective Hamiltonian are cancelled with the assistance of a strong classical field, thus the scheme is insensitive to both the cavity decay and the thermal field.

Abstract: In this paper, we propose a physical scheme to concentrate non-maximally entangled atomic pure states by using atomic collision in a far-off-resonant cavity. The most distinctive advantage of our scheme is that the non-maximally entangled atoms may be far from or near each other and their degree of entanglement can be maximally amplified. The photon-number-dependent parts in the effective Hamiltonian are cancelled with the assistance of a strong classical field, thus the scheme is insensitive to both the cavity decay and the thermal field.

Key words: entangled atomic states, GHZ state, concentration, cavity quantum electrodynamics

中图分类号:  (Entanglement and quantum nonlocality)

  • 03.65.Ud
03.67.Mn (Entanglement measures, witnesses, and other characterizations) 42.50.Dv (Quantum state engineering and measurements) 42.50.Pq (Cavity quantum electrodynamics; micromasers)