中国物理B ›› 2009, Vol. 18 ›› Issue (11): 4676-4682.doi: 10.1088/1674-1056/18/11/011

• • 上一篇    下一篇

Entanglement sudden death of two atoms interacting with a cavity via the two-photon process in a strong-driving-assisted system

邵晓强1, 陈丽2, 张寿3   

  1. (1)Center for the Condensed-Matter Science and Technology, Harbin Institute of Technology, Harbin 150001, China; (2)Department of Physics, College of Science, Yanbian University, Yanji 133002, China; (3)Department of Physics, College of Science, Yanbian University, Yanji 133002, China;Center for the Condensed-Matter Science and Technology, Harbin Institute of Technology, Harbin 150001, China
  • 收稿日期:2009-02-21 修回日期:2009-03-31 出版日期:2009-11-20 发布日期:2009-11-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No 60667001) and the Education Foundation of Yanbian University of China.

Entanglement sudden death of two atoms interacting with a cavity via the two-photon process in a strong-driving-assisted system

Chen Li(陈丽)a),Shao Xiao-Qiang(邵晓强) b), and Zhang Shou(张寿)a)b)†   

  1. a Department of Physics, College of Science, Yanbian University, Yanji 133002, China; b Center for the Condensed-Matter Science and Technology, Harbin Institute of Technology, Harbin 150001, China
  • Received:2009-02-21 Revised:2009-03-31 Online:2009-11-20 Published:2009-11-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No 60667001) and the Education Foundation of Yanbian University of China.

PDF (PC)

762

赞

摘要： We examine the entanglement dynamics between two strongly driven atoms off-resonantly coupled with a single-mode cavity via the two-photon process with the help of negativity in two different types of initial states. The results show that entanglement sudden death may occur under both the above conditions and the sudden death effect can be monitored by modulating the atom--cavity detunings. Furthermore, we also find an atomic decoherence-free subspace so that the initial entanglement between two atoms remains invariable in application.

Abstract: We examine the entanglement dynamics between two strongly driven atoms off-resonantly coupled with a single-mode cavity via the two-photon process with the help of negativity in two different types of initial states. The results show that entanglement sudden death may occur under both the above conditions and the sudden death effect can be monitored by modulating the atom--cavity detunings. Furthermore, we also find an atomic decoherence-free subspace so that the initial entanglement between two atoms remains invariable in application.

Key words: entanglement sudden death, negativity, atom--cavity detuning, decoherence-free subspace

中图分类号:  (Quantum computation architectures and implementations)

  • 03.67.Lx
03.67.Mn (Entanglement measures, witnesses, and other characterizations) 32.80.Wr (Other multiphoton processes) 03.65.Yz (Decoherence; open systems; quantum statistical methods) 42.50.-p (Quantum optics)