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Non-Markovian effect on the quantum discord

Non-Markovian effect on the quantum discord,10.1103/PhysRevA.81.014101,Physical Review A,Bo Wang,Zhen-Yu Xu,Ze-Qian Chen,Mang Feng

Non-Markovian effect on the quantum discord   (Citations: 2)
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We study the non-Markovian effect on the dynamics of the quantum discord by exactly solving a model consisting of two independent qubits subject to two zero-temperature non-Markovian reservoirs, respectively. Considering the two qubits initially prepared in Bell-like or extended Werner-like states, we show that there is no occurrence of the sudden death, but only instantaneous disappearance of the quantum discord at some time points, in comparison to the entanglement sudden death in the same range of the parameters of interest. This implies that the quantum discord is more useful than the entanglement to describe the quantum correlation involved in quantum systems.
Journal: Physical Review A - PHYS REV A , vol. 81, no. 1, 2010
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