Avoiding the decay of entanglement for coupling two-qubit system interacting with a non-Markov environment

doi:10.1088/1674-1056/20/7/070304

中国物理B ›› 2011, Vol. 20 ›› Issue (7): 70304-070304.doi: 10.1088/1674-1056/20/7/070304

Avoiding the decay of entanglement for coupling two-qubit system interacting with a non-Markov environment

嵇英华, 刘咏梅, 王资生

收稿日期:2010-09-22 修回日期:2010-10-13 出版日期:2011-07-15 发布日期:2011-07-15

Avoiding the decay of entanglement for coupling two-qubit system interacting with a non-Markov environment

Ji Ying-Hua(嵇英华)^a)b)†, Liu Yong-Mei(刘咏梅)^a)c), and Wang Zi-Sheng(王资生)^a)b)

^aCollege of Physics and Communication Electronics, Jiangxi Normal University, Nanchang 330022, China; ^bKey Laboratory of Optoelectronic and Telecommunication of Jiangxi, Nanchang 330022, China; ^cCollege of Mathematics and Information Science of Jiangxi Normal University, Nanchang 330022, China

Received:2010-09-22 Revised:2010-10-13 Online:2011-07-15 Published:2011-07-15

摘要/Abstract

摘要： The entanglement evolution of the coupled qubits interacting with a non-Markov environment is investigated in terms of concurrence. The results show that the entanglement of the quantum systems depends not only on the initial state of the system but also on the coupling between the qubit and the environment. For the initial state (|00〉± | 11〉) /√2, the coupled qubits will always been in the maximum entangled state under an asymmetric coupling. For the initial state (|01〉± | 10〉) /√2, in contrast, the entangling degree of the coupled qubits is always equal to unity and does not depend on the evolving time under the symmetric coupling. We find that the stronger the interaction between the qubits is, the better the struggle against the entanglement sudden death is.

关键词: entanglement, symmetry, non-Markov process, concurrence

Abstract: The entanglement evolution of the coupled qubits interacting with a non-Markov environment is investigated in terms of concurrence. The results show that the entanglement of the quantum systems depends not only on the initial state of the system but also on the coupling between the qubit and the environment. For the initial state (|00〉± | 11〉) /√2, the coupled qubits will always been in the maximum entangled state under an asymmetric coupling. For the initial state (|01〉± | 10〉) /√2, in contrast, the entangling degree of the coupled qubits is always equal to unity and does not depend on the evolving time under the symmetric coupling. We find that the stronger the interaction between the qubits is, the better the struggle against the entanglement sudden death is.

Key words: entanglement, symmetry, non-Markov process, concurrence

中图分类号: (Decoherence; open systems; quantum statistical methods)

03.65.Yz

03.65.Ud (Entanglement and quantum nonlocality)

嵇英华, 刘咏梅, 王资生. Avoiding the decay of entanglement for coupling two-qubit system interacting with a non-Markov environment[J]. 中国物理B, 2011, 20(7): 70304-070304.

Ji Ying-Hua(嵇英华), Liu Yong-Mei(刘咏梅), and Wang Zi-Sheng(王资生). Avoiding the decay of entanglement for coupling two-qubit system interacting with a non-Markov environment[J]. Chin. Phys. B, 2011, 20(7): 70304-070304.

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Avoiding the decay of entanglement for coupling two-qubit system interacting with a non-Markov environment

Avoiding the decay of entanglement for coupling two-qubit system interacting with a non-Markov environment

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