中国物理B ›› 2010, Vol. 19 ›› Issue (2): 24209-024209.doi: 10.1088/1674-1056/19/2/024209

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Effect of mode-mode competition on atom－atom entanglement

方卯发1, 蔡建武2, 吴琴3   

  1. (1)College of Physics and Information Science, Hunan Normal University, Changsha 410081, China; (2)Department of Physics, Hunan Industrial University, Zhuzhou 412007, China; (3)School of Basic Medical Science, Guangdong Medical College, Zhanjiang 524023, China
  • 收稿日期:2009-04-16 修回日期:2009-06-05 出版日期:2010-02-15 发布日期:2010-02-15
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No.~10374025), the Foundation of Education Bureau of Hunan Province, China (Grant Nos.~06A038 and 06C080) and the Zhanjiang Projects for Development of Science and Technology, China (Grant No.~2008C10019).

Effect of mode-mode competition on atom－atom entanglement

Wu Qin(吴琴)a)†, Fang Mao-Fa(方卯发)b), and Cai Jian-Wu(蔡建武)c)   

  1. a School of Basic Medical Science, Guangdong Medical College, Zhanjiang 524023, China; b College of Physics and Information Science, Hunan Normal University, Changsha 410081, China; c Department of Physics, Hunan Industrial University, Zhuzhou 412007, China
  • Received:2009-04-16 Revised:2009-06-05 Online:2010-02-15 Published:2010-02-15
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No.~10374025), the Foundation of Education Bureau of Hunan Province, China (Grant Nos.~06A038 and 06C080) and the Zhanjiang Projects for Development of Science and Technology, China (Grant No.~2008C10019).

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摘要： A system consisting of two atoms interacting with a two-mode vacuum is considered, where each atom is resonant with the two cavity modes through two different competing transitions. The effect of mode--mode competition on the atom--atom entanglement is investigated. We find that the entanglement between the two atoms can be induced by the mode--mode competition. For the initial atomic state |\varPsi(0)\rangle, whether the atoms are initially separated or entangled, a large or even maximal entanglement between them can be obtained periodically by introducing the mode--mode competition. For the initial atomic state |\varPhi(0)\rangle, the strong mode--mode competition can prevent the two atoms entangled initially from suffering entanglement sudden death; besides, it makes them in a more stable and longer-lived entanglement than in the non-competition case.

Abstract: A system consisting of two atoms interacting with a two-mode vacuum is considered, where each atom is resonant with the two cavity modes through two different competing transitions. The effect of mode--mode competition on the atom--atom entanglement is investigated. We find that the entanglement between the two atoms can be induced by the mode--mode competition. For the initial atomic state $|\varPsi(0)\rangle$, whether the atoms are initially separated or entangled, a large or even maximal entanglement between them can be obtained periodically by introducing the mode--mode competition. For the initial atomic state $|\varPhi(0)\rangle$, the strong mode--mode competition can prevent the two atoms entangled initially from suffering entanglement sudden death; besides, it makes them in a more stable and longer-lived entanglement than in the non-competition case.

Key words: mode--mode competition, concurrence, entanglement sudden death

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

  • 42.50.Dv
03.65.Ud (Entanglement and quantum nonlocality) 03.67.Mn (Entanglement measures, witnesses, and other characterizations) 32.80.-t (Photoionization and excitation)