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International Journal of Theoretical Physics

Overcoming Decoherent Effects from Squeezed Vacuum Reservoir

H S Smitha Rao, Liyun Hu, G.Q. Liu, Zhen Wang

Published May 20, 2010• 2 citations
Publisher
DOI
10.1007/s10773-010-0378-2

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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.
We investigate the dynamical behavior of quantum discord for the coupling qubits that placed in squeezed vacuum reservoir and initially in decoherence-free subspace (DFS). The results show that the DFS for resisting the effects from environmental decoherence and disentanglement is not the DFS of quantum discord. We also find that under certain conditions, the quantum discord and entanglement perform completely inversely versus the squeezed parameters. The quantum discord is controlled by the squeezed parameters, especially in the initial stage of the evolution, the bigger the parameter is, and the longer the time of initial death will be.