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

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 env...

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Bibliographic Details
Published in:Chinese physics B 2011-07, Vol.20 (7), p.64-68
Main Author: 嵇英华 刘咏梅 王资生
Format: Article
Language:English
Subjects:
Asymmetry
Decay
Entangled states
Entanglement
Evolution
Joining
Qubits (quantum computing)
Unity
互耦合
交互系统
初始状态
最大纠缠态
衰变
量子位
量子比特
马尔可夫环境
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Summary: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.
ISSN:1674-1056
2058-3834
DOI:10.1088/1674-1056/20/7/070304