Investigations into quantum correlation of coupled qubits in a squeezed vacuum reservoir
Investigations into quantum correlation of coupled qubits in a squeezed vacuum reservoir
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压缩真空容器中耦合量子位的量子相关性研究
DOI：
10.1088/1674-1056/22/2/020305
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发表时间：
2013-02
影响因子：
1.7
通讯作者：
嵇英华,刘咏梅
中科院分区：
文献类型：
--
作者：
嵇英华,刘咏梅
本文研究了压缩真空储层中初始处于最大纠缠混合态的耦合量子比特的量子相关性。比较分析了压缩参数对量子不和谐和量子并发的影响。结果表明，在压缩真空储层中，随着压缩参数的变化，量子失谐和量子并发的行为完全相反。随着压缩振幅参数的增大，量子不和谐存活时间延长，而纠缠死亡速度反而加快。结果还表明，系统的经典相关小于真空储层中的量子不谐，而大于压缩真空储层中的量子不谐。在两种储层环境中，量子不和谐和经典相关比量子并发更强，这表明在压缩真空储层中，量子不和谐更容易受到退相干的影响，而量子不和谐具有更强的避免退相干的能力。
In this paper, we investigate the quantum correlation of coupled qubits which are initially in maximally entangled mixed states in a squeezed vacuum reservoir. We compare and analyze the effects of squeezed parameters on quantum discord and quantum concurrence. The results show that in a squeezed vacuum reservoir, the quantum discord and quantum concurrence perform with completely opposite behaviors with the change of squeezed parameters. Quantum discord survives longer with the increase of squeezed amplitude parameter, but entanglement death is faster on the contrary. The results also indicate that the classical correlation of the system is smaller than quantum discord in a vacuum reservoir, while it is bigger than quantum discord in a squeezed vacuum reservoir. The quantum discord and classical correlation are more robust than quantum concurrence in the two reservoir environments, which indicates that the entanglement actually is easily affected by decoherence and quantum discord has a stronger ability to avoid decoherence in a squeezed vacuum reservoir.
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影响因子：
8.6
作者：
Ollivier, H;Zurek, WH
通讯作者：
Zurek, WH
影响因子：
2.9
作者：
Hernandez, Maritza;Orszag, Miguel
通讯作者：
Orszag, Miguel
影响因子：
8.6
作者：
Mazzola, L.;Piilo, J.;Maniscalco, S.
通讯作者：
Maniscalco, S.
影响因子：
1.7
作者：
Y. Qian;Jingpin Xu
通讯作者：
Y. Qian;Jingpin Xu
DOI：
10.1088/0953-4075/44/1/015503
发表时间：
2011-01
期刊：
Journal of Physics B: Atomic, Molecular and Optical Physics
影响因子：
--
作者：
Cheng-Zhi Wang;Chun-Xian Li;L. Nie;Jiang-Fan Li
通讯作者：
Cheng-Zhi Wang;Chun-Xian Li;L. Nie;Jiang-Fan Li