Robustness investigations on quantum entanglement and quantum discord of coupled qubits in squeezed vacuum reservoir |
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| Authors: | YingHua Ji YongMei Liu |
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| Institution: | 1. Department of Physics, Jiangxi Normal University, Nanchang, Jiangxi 330022, China;2. College of Mathematics and Information Science of Jiangxi Normal University, Nanchang, Jiangxi 330022, China;3. Key Laboratory of Photoelectronics and Telecommunication of Jiangxi Province, Nanchang, Jiangxi 330022, China |
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| Abstract: | We investigate the quantum discord of coupled qubits in squeezed vacuum reservoir and compare it with the quantum entanglement of system. We find that the quantum discord and entanglement perform completely oppositely with the change of squeezed parameters. Quantum discord survives longer with the increase of squeezed amplitude parameter and entanglement death faster on the contrary. Under high squeezed amplitude parameter, the quantum discord can keep nonzero which indicate that the quantum discord is more robust than entanglement. We also find that the purity reduction of the initial quantum state will lead to the decay of concurrence or quantum discord. However, the quantum discord damps remarkably more slowly and survives longer than concurrence. |
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| Keywords: | 03 65 Ta 03 67 &minus a |
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