Dynamics of quantum discord for a two-qubit system  

作　　者：杨雄 肖佳华 

机构地区：[1]Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, Department of Physics and Information Science, Hunan Normal University

出　　处：《Optoelectronics Letters》2013年第1期69-72,共4页光电子快报（英文版）

基　　金：supported by the Natural Science Foundation of Hunan Province (No.12JJ6002);the Science and Technology Plan of Hunan Province (No.2012FJ3087)

摘　　要：We study the dynamics of quantum discord of a two-qubit system coupled to a common structured reservoir at zero temperature. The conditions to maximize reservoir-induced quantum discord for the two-qubit system wiht an initially factorized state are derived. In particular, when the two qubits are placed in a lossy cavity, high values of quantum discord can be obtained in the dispersive regime, even in the bad-cavity limit. Finally, we show that under certain conditions, the quantum discord dynamics exhibits quantum beats.We study the dynamics of quantum discord of a two-qubit system coupled to a common structured reservoir at zero temperature. The conditions to maximize reservoir-induced quantum discord for the two-qubit system wiht an irdtially factorized state are derived. In particular, when the two qubits are placed in a in the dispersive regime, even in the bad-cavity limit. Finally, dynamics exhibits quantum beats. lossy cavity, high values of quantum discord can be obtained we show that under certain conditions, the quantum discord

关 键 词：量子动力学 量子比特 和谐 系统 动态表现 结构化 工厂化 量子拍 

分 类 号：O413.1[理学—理论物理] TP38[理学—物理]