Quantum Discord of two Coupled Qubits with Initial System-reservoir Correlation |
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Authors: | Guo-You Wang You-Neng Guo |
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Institution: | 1.College of Science,Hunan University of Technology,Zhuzhou,People’s Republic of China;2.Department of Electronic and Communication Engineering,Changsha University,Changsha,People’s Republic of China |
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Abstract: | Recently, the effect of initial qubit-reservoir correlation for two qubits in a common reservoir on the entanglement dynamics has been studied by Yan and Xia (Acta Sinica Quantum Optica 20, 16 2014). We extend their results and investigate how the initial qubit-reservoir correlation and dipole-dipole interaction between two qubits effect on dynamics of quantum discord in Markovian and non-Markovian regimes, respectively. The results show that in general, the larger initial qubit-reservoir correlation and dipole-dipole interaction can retard the decay of quantum discord. Besides, a combination of relatively strong dipole-dipole interaction and non-Markovian effect can efficiently protect quantum discord. Finally,thecomparisonbetweenevolutionsofquantumdiscordandentanglementisalsoconsidered. |
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