中国物理B ›› 2010, Vol. 19 ›› Issue (4): 44204-044204.doi: 10.1088/1674-1056/19/4/044204

• CLASSICAL AREAS OF PHENOMENOLOGY • 上一篇    下一篇

Decoherence-immune generation of highly entangled states for two atoms

郑仕标   

  1. Department of Physics and State Key Laboratory Breeding Base of Photocatalysis, Fuzhou University, Fuzhou 350002, China
  • 收稿日期:2008-12-28 修回日期:2009-05-12 出版日期:2010-04-15 发布日期:2010-04-15
  • 基金资助:
    Project supported by funds from the State Key Laboratory Breeding Base of Photocatalysis, Fuzhou University.

Decoherence-immune generation of highly entangled states for two atoms

Zheng Shi-Biao(郑仕标)†   

  1. Department of Physics and State Key Laboratory Breeding Base of Photocatalysis, Fuzhou University, Fuzhou 350002, China
  • Received:2008-12-28 Revised:2009-05-12 Online:2010-04-15 Published:2010-04-15
  • Supported by:
    Project supported by funds from the State Key Laboratory Breeding Base of Photocatalysis, Fuzhou University.

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摘要： This paper proposes a decoherence-immune scheme for generating highly entangled states for two atoms trapped in a cavity. The scheme is based on two resonant atom-cavity interactions. Conditional upon the detection of no photon, the two atoms may exchange an excitation via the first resonant interaction, which leads to entanglement. Due to the loss of the excitation, the two atoms are in a mixed entangled state. With the help of an auxiliary ground state not coupled to the cavity mode, the state related to the excitation loss is eliminated by the detection of a photon resulting from the second resonant interaction. Thus, the fidelity of entanglement is almost not affected by the decoherence.

Abstract: This paper proposes a decoherence-immune scheme for generating highly entangled states for two atoms trapped in a cavity. The scheme is based on two resonant atom-cavity interactions. Conditional upon the detection of no photon, the two atoms may exchange an excitation via the first resonant interaction, which leads to entanglement. Due to the loss of the excitation, the two atoms are in a mixed entangled state. With the help of an auxiliary ground state not coupled to the cavity mode, the state related to the excitation loss is eliminated by the detection of a photon resulting from the second resonant interaction. Thus, the fidelity of entanglement is almost not affected by the decoherence.

Key words: entangled state, resonant interaction, auxiliary ground state

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

  • 42.50.Dv
37.10.De (Atom cooling methods) 42.50.Pq (Cavity quantum electrodynamics; micromasers)