中国物理B ›› 2009, Vol. 18 ›› Issue (12): 5336-5341.doi: 10.1088/1674-1056/18/12/036

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The entanglement between two isolated atoms in double mode--mode competition model

方卯发1, 胡要花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, Dongguan 523808, China
  • 收稿日期:2009-02-08 修回日期:2009-03-17 出版日期:2009-12-20 发布日期:2009-12-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No 10374025), the Foundation of Education Department of Hunan Province of China (Grant Nos 06A038 and 06C080) and the Science and Technology Project of Zhanjiang City (Grant No 2

The entanglement between two isolated atoms in double mode--mode competition model

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

  1. a School of Basic Medical Science, Guangdong Medical College, Dongguan 523808, 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:2009-02-08 Revised:2009-03-17 Online:2009-12-20 Published:2009-12-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No 10374025), the Foundation of Education Department of Hunan Province of China (Grant Nos 06A038 and 06C080) and the Science and Technology Project of Zhanjiang City (Grant No 2

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摘要： Extending the double Jaynes--Cummings model to a more complicated case where the mode--mode competition is considered, we investigate the entanglement character of two isolated atoms by means of concurrence, and discuss the dependence of atom--atom entanglement on the different initial state and the relative coupling strength between the atom and the corresponding cavity field. The results show that the amplitude and the period of the atom--atom entanglement evolution can be controlled by the choice of initial state and relative coupling strength, respectively. We find that the phenomenon of entanglement sudden death (ESD) is sensitive to the initial conditions. The length of the time interval for zero entanglement depends not only on the initial degree of entanglement between two atoms but also on the relative coupling strength of atom--field interaction. The ESD effect can be weakened by enhancing the mode--mode competition between the three- and single-photon processes.

Abstract: Extending the double Jaynes--Cummings model to a more complicated case where the mode--mode competition is considered, we investigate the entanglement character of two isolated atoms by means of concurrence, and discuss the dependence of atom--atom entanglement on the different initial state and the relative coupling strength between the atom and the corresponding cavity field. The results show that the amplitude and the period of the atom--atom entanglement evolution can be controlled by the choice of initial state and relative coupling strength, respectively. We find that the phenomenon of entanglement sudden death (ESD) is sensitive to the initial conditions. The length of the time interval for zero entanglement depends not only on the initial degree of entanglement between two atoms but also on the relative coupling strength of atom--field interaction. The ESD effect can be weakened by enhancing the mode--mode competition between the three- and single-photon processes.

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

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

  • 42.50.Dv
03.65.Ud (Entanglement and quantum nonlocality)