Protecting entanglement by detuning: in Markovian environments vs in non-Markovian environments

doi:10.1088/1674-1056/19/9/090318

中国物理B ›› 2010, Vol. 19 ›› Issue (9): 90318-090318.doi: 10.1088/1674-1056/19/9/090318

Protecting entanglement by detuning: in Markovian environments vs in non-Markovian environments

方卯发¹, 黄利元²

(1)College of Physics and Information Science, Hunan Normal University, Changsha 410081, China; (2)Department of Electronic and Communication Engineering, Changsha University, Changsha 410081, China

收稿日期:2009-12-25 修回日期:2010-02-27 出版日期:2010-09-15 发布日期:2010-09-15

Protecting entanglement by detuning: in Markovian environments vs in non-Markovian environments

Huang Li-Yuan(黄利元)^a)^† and Fang Mao-Fa(方卯发)^b)

^a Department of Electronic and Communication Engineering, Changsha University, Changsha 410081, China; ^b College of Physics and Information Science, Hunan Normal University, Changsha 410081, China

Received:2009-12-25 Revised:2010-02-27 Online:2010-09-15 Published:2010-09-15

摘要/Abstract

摘要： The models of two qubits separately trapped in two independent Markovian or non-Markovian environments have been investigated. The distinction of the two-qubit entanglement dynamics in different environments has also been discussed in detail. The results show that, in non-Markovian environments, the possible usage time of entanglement can be extended due to its memory effect. On the other hand, we note that, compared to Markovian environments, the two-qubit entanglement could be protected better in non-Markovian environments by modulating the detuning between qubits and cavities. Finally, an intuitive physical interpretation for these results is given.

Abstract: The models of two qubits separately trapped in two independent Markovian or non-Markovian environments have been investigated. The distinction of the two-qubit entanglement dynamics in different environments has also been discussed in detail. The results show that, in non-Markovian environments, the possible usage time of entanglement can be extended due to its memory effect. On the other hand, we note that, compared to Markovian environments, the two-qubit entanglement could be protected better in non-Markovian environments by modulating the detuning between qubits and cavities. Finally, an intuitive physical interpretation for these results is given.

Key words: protecting entanglement, Markovian environment, non-Markovian environment

中图分类号:

0367

黄利元, 方卯发. Protecting entanglement by detuning: in Markovian environments vs in non-Markovian environments[J]. 中国物理B, 2010, 19(9): 90318-090318.

Huang Li-Yuan(黄利元) and Fang Mao-Fa(方卯发). Protecting entanglement by detuning: in Markovian environments vs in non-Markovian environments[J]. Chin. Phys. B, 2010, 19(9): 90318-090318.

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Protecting entanglement by detuning: in Markovian environments vs in non-Markovian environments

Protecting entanglement by detuning: in Markovian environments vs in non-Markovian environments

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