Quantum discord dynamics of two-qubit system in a quantum spin environment |
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Authors: | J L Guo Y J Mi H S Song |
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Institution: | 1.College of Physics and Electronic Information Science,Tianjin Normal University,Tianjin,P.R. China;2.School of Science,Hebei University of Technology,Tianjin,P.R. China;3.School of Physics and Optoelectronic Technology,Dalian University of Technology,Dalian,P.R. China |
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Abstract: | We study the dynamics of quantum discord of two-qubit system in a quantum spin
environment at finite temperature in the thermodynamics limit. Special attention is paid
to the difference between the entanglement and quantum discord when considering the
influences of the environment temperature and the initial system states. We show that in
the same range of the physical parameters, when the system states behave no entanglement
or entanglement sudden death, the quantum discord keeps nonzero. So the quantum discord is
more robust than entanglement under this decoherence environment. Furthermore, we also
illustrate that we can tune the parameters related to the system and the environment to
suppress the decay of quantum discord. |
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Keywords: | |
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