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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) |
| a College of Physics and Communication Electronics, Jiangxi Normal University, Nanchang 330022, China; b Key Laboratory of Optoelectronic and Telecommunication of Jiangxi, Nanchang 330022, China; c College of Mathematics and Information Science of Jiangxi Normal University, Nanchang 330022, China |
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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.
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Received: 22 September 2010
Revised: 13 October 2010
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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03.65.Ud
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(Entanglement and quantum nonlocality)
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Cite this article:
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 2011 Chin. Phys. B 20 070304
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