中国物理B ›› 2015, Vol. 24 ›› Issue (11): 110305-110305.doi: 10.1088/1674-1056/24/11/110305

• GENERAL • 上一篇    下一篇

Entanglement dynamics of a three-qubit system with different interatomic distances

封玲娟a, 张英杰a b, 张路a, 夏云杰a   

  1. a Shandong Provincial Key Laboratory of Laser Polarization and Information Technology, Department of Physics, Qufu Normal University, Qufu 273165, China;
    b Beijing National Laboratory of Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
  • 收稿日期:2015-04-25 修回日期:2015-06-17 出版日期:2015-11-05 发布日期:2015-11-05
  • 通讯作者: Xia Yun-Jie E-mail:yjxia@mail.qfnu.edu.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 61178012, 11204156, and 11304179), the Specialized Research Fund for the Doctoral Program of Higher Education, China (Grant Nos. 20133705110001 and 20123705120002), and the Natural Science Foundation of Shandong Province, China (Grant Nos. BS2013DX034, ZR2012FQ024, and ZR2014AP009).

Entanglement dynamics of a three-qubit system with different interatomic distances

Feng Ling-Juan (封玲娟)a, Zhang Ying-Jie (张英杰)a b, Zhang Lu (张路)a, Xia Yun-Jie (夏云杰)a   

  1. a Shandong Provincial Key Laboratory of Laser Polarization and Information Technology, Department of Physics, Qufu Normal University, Qufu 273165, China;
    b Beijing National Laboratory of Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
  • Received:2015-04-25 Revised:2015-06-17 Online:2015-11-05 Published:2015-11-05
  • Contact: Xia Yun-Jie E-mail:yjxia@mail.qfnu.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 61178012, 11204156, and 11304179), the Specialized Research Fund for the Doctoral Program of Higher Education, China (Grant Nos. 20133705110001 and 20123705120002), and the Natural Science Foundation of Shandong Province, China (Grant Nos. BS2013DX034, ZR2012FQ024, and ZR2014AP009).

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摘要： We investigate the tripartite entanglement dynamics of three two-level atoms in a multi-mode vacuum field. By considering the influences of the interatomic distance and the initial condition on the lower bound of concurrence and the tripartite negativity, we show that an optimal interatomic distance can be found to minimize the collective damping. Interestingly, at the same optimal distance, the tripartite entanglement would be maximized in the open dynamics process. In the case of shorter interatomic distance, the tripartite entanglement can display the oscillatory behavior in the initial short-time limit and be trapped in a stationary value in the long-time limit. In addition, the tripartite entanglement for the general situation with different interatomic distances is also discussed.

关键词: quantum entanglement, the lower bound of concurrence, W state, interatomic distance

Abstract: We investigate the tripartite entanglement dynamics of three two-level atoms in a multi-mode vacuum field. By considering the influences of the interatomic distance and the initial condition on the lower bound of concurrence and the tripartite negativity, we show that an optimal interatomic distance can be found to minimize the collective damping. Interestingly, at the same optimal distance, the tripartite entanglement would be maximized in the open dynamics process. In the case of shorter interatomic distance, the tripartite entanglement can display the oscillatory behavior in the initial short-time limit and be trapped in a stationary value in the long-time limit. In addition, the tripartite entanglement for the general situation with different interatomic distances is also discussed.

Key words: quantum entanglement, the lower bound of concurrence, W state, interatomic distance

中图分类号:  (Quantum information)

  • 03.67.-a
03.65.Yz (Decoherence; open systems; quantum statistical methods) 03.65.Ud (Entanglement and quantum nonlocality)