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Discord and entanglement in non-Markovian environments at finite temperatures |
| Hong-Mei Zou(邹红梅), Mao-Fa Fang(方卯发) |
| Key Laboratory of Low-dimensional Quantum Structures and Quantum Control of Ministry of Education, College of Physics and Information Science, Hunan Normal University, Changsha 410081, China |
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Abstract The dynamic evolutions of the discord and entanglement of two atoms immersed in two independent Lorentzian reservoirs at zero and finite temperatures have been investigated by using the time-convolutionless master-equation method. Our results show that, nonzero temperature can induce the entanglement sudden death and accelerate the decays of discord and entanglement. The discord and the entanglement have different robustness for different initial states and their robustness may change under certain conditions. When both the non-Markovian effect and detuning are present simultaneously, due to the memory and feedback effect of non-Markovian reservoirs, the discord and entanglement can be effectively protected even at nonzero temperature by increasing the non-Markovian effect and the detuning.
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Received: 30 July 2015
Revised: 20 October 2015
Accepted manuscript online:
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PACS:
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03.65.Yz
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(Decoherence; open systems; quantum statistical methods)
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03.67.-a
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(Quantum information)
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42.50.Pq
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(Cavity quantum electrodynamics; micromasers)
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| Fund: Project supported by the Science and Technology Plan of Hunan Province, China (Grant No. 2010FJ3148), the National Natural Science Foundation of China (Grant No. 11374096), and the Doctoral Science Foundation of Hunan Normal University, China. |
Corresponding Authors:
Hong-Mei Zou
E-mail: zhmzc1997@126.com
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Cite this article:
Hong-Mei Zou(邹红梅), Mao-Fa Fang(方卯发) Discord and entanglement in non-Markovian environments at finite temperatures 2016 Chin. Phys. B 25 090302
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