Avoiding the decay of entanglement for coupling two-qubit system interacting with a non-Markov environment 被引量：4

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

下载PDF

导出

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 （100） ± ｜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. 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 （100） ± ｜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.

作者嵇英华刘咏梅王资生

机构地区 College of Physics and Communication Electronics Key Laboratory of Optoelectronic and Telecommunication of Jiangxi College of Mathematics and Information Science of Jiangxi Normal University

出处《Chinese Physics B》 SCIE EI CAS CSCD 2011年第7期64-68,共5页 中国物理B（英文版）

基金 Project supported by the National Natural Science Foundation of China (Grant No.10864002)

关键词 ENTANGLEMENT SYMMETRY non-Markov process CONCURRENCE entanglement, symmetry, non-Markov process, concurrence

分类号 O413.1 [理学—理论物理] TP181 [自动化与计算机技术—控制理论与控制工程]

引文网络
相关文献

参考文献22

1Wang Z S, Kwek L C, Lai C H and Oh C H 2005 Eur. Phys. J. D 33 285.
2Ji Y H and Hu J J 2010 Chin. Phys. B 19 060304.
3Yang C P and Han S 2006 Phys. Rev. A 73 032317.
4Wang Z S 2009 Phys. Rev. A 79 024304.
5Wang Z S, Liou G Q and Ji Y H 2009 Phys. Rev. A 79 054301.
6Chen Z Q, Wang J Q, Li X L, Ji Y H, Zhang B R, Jiang Y Y and Wang Z S 2009 Int. J. Theor. Phys. 48 2904.
7Jiang D Y, Wu R, Li S S and Wang Z S 2009 Int. Y. Theor. Phys. 48 2297.
8Cai X H, Guo J R, Nie J J and Jia J P 2006 Chin. Phys. 15 488.
9Bennett C H and Wiesner S J 1992 Phys. Rev. Lett. 69 2881.
10Yu T and Eberly J H 2004 Phys. Rev. Lett. 93 140404.