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

作　　者：封玲娟 张英杰 张路 夏云杰 

机构地区：[1]Shandong Provincial Key Laboratory of Laser Polarization and Information Technology,Department of Physics, Qufu Normal University [2]Beijing National Laboratory of Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences

出　　处：《Chinese Physics B》2015年第11期103-109,共7页中国物理B（英文版）

基　　金：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);the Natural Science Foundation of Shandong Province,China(Grant Nos.BS2013DX034,ZR2012FQ024,and ZR2014AP009)

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.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 

分 类 号：O413.1[理学—理论物理]