Classical Correlation and Quantum Discord in a Two Qubit System Under Dissipation Environments |
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Authors: | Ying-Juan Mi |
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Institution: | 1. School of Science, Hebei University of Technology, Tianjin, 300401, China
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Abstract: | We study the dynamics of classical correlation and quantum discord of two-qubit system interacted with the thermal reservoir.
Special attention is paid to the difference between the entanglement and quantum discord when considering the influences of
the nonzero mean photon number and quantum fluctuation of the vacuum. It is shown that in the same range of the physical parameters,
the factors leading to the entanglement sudden death only accelerates the decay of quantum discord, and the quantum discord
can last for an infinite period when the entanglement disappears. So the quantum discord is more robust than entanglement
under this decoherence environment, and quantum discord is a more general measure of quantum correlation than entanglement. |
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Keywords: | |
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