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Dynamics of quantum discord for a two-qubit system

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【Author】 YANG Xiong** and XIAO Jia-hua Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, Department of Physics and Information Science, Hunan Normal University, Changsha 410081, China,

【机构】 Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, Department of Physics and Information Science, Hunan Normal University；

【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.更多还原

【Abstract】 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.更多还原

【关键词】 initially； reservoir； entanglement； resonant； maximize； dispersive； entangled； regime； bipartite； structured；

【基金】 supported by the Natural Science Foundation of Hunan Province (No.12JJ6002);the Science and Technology Plan of Hunan Province (No.2012FJ3087)

【文献出处】 Optoelectronics Letters ,光电子快报(英文版) , 编辑部邮箱 ,2013年01期

【分类号】O413.1
【被引频次】2
【下载频次】36

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