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

作　　者：陈丽 邵晓强 张寿 

机构地区：[1]Department of Physics,College of Science,Yanbian University [2]Center for the Condensed-Matter Science and Technology,Harbin Institute of Technology

出　　处：《Chinese Physics B》2009年第11期4676-4682,共7页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China (Grant No 60667001);the Education Foundation of Yanbian University of China

摘　　要：We examine the entanglement dynamics between two strongly driven atoms off-resonantly coupled with a singlemode 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.We examine the entanglement dynamics between two strongly driven atoms off-resonantly coupled with a singlemode 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.

关 键 词：entanglement sudden death NEGATIVITY atom-cavity detuning decoherence-free sub-space 

分 类 号：O431.2[机械工程—光学工程] O562[理学—光学]