Quantum discord dynamics of two qubits in single-mode cavities

作     者：王晨 陈庆虎 

作者机构：Department of Physics Zhejiang University Center for Statistical and Theoretical Condensed Matter Physics Zhejiang Normal University 

出 版 物：《Chinese Physics B》 (中国物理B（英文版）)

年 卷 期：2013年第22卷第4期

页      面：103-109页

核心收录：

学科分类：07[理学] 070201[理学-理论物理] 0702[理学-物理学] 

基　　金：Project supported by the National Natural Science Foundation of China (Grant No. 11174254) the National Basic Research Program of China (Grant Nos. 2011CBA00103 and 2009CB929104) 

主　　题：quantum information cavity quantum electrodynamics entanglement and quantum nonlocality 

摘      要：The dynamics of quantum discord for two identical qubits in two independent single-mode cavities and a common single-mode cavity are discussed. For the initial Bell state with correlated spins, while the entanglement sudden death can occur, the quantum discord vanishes only at discrete moments in the independent cavities and never vanishes in the common cavity. Interestingly, quantum discord and entanglement show opposite behavior in the common cavity, unlike in the independent cavities. For the initial Bell state with anti-correlated spins, quantum discord and entanglement behave in the same way for both independent cavities and a common cavity. It is found that the detunings always stabilize the quantum discord.