Optimizing quantum correlation dynamics by weak measurement in dissipative environment

We investigate the protection of quantum correlations of two qubits in independent vacuum reservoirs by means of weak measurements. It is found that the weak measurement can reduce the amount of quantum correlation for one type of initial state at the beginning in a non-Markovian environment and mea...

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Bibliographic Details
Published inChinese physics B Vol. 24; no. 4; pp. 221 - 226
Main Author 杜少将 夏云杰 段德洋 张路 高强
Format Journal Article
LanguageEnglish
Published 01.04.2015
Subjects
Correlation analysis
Dissipation
Entanglement
Evolution
Markov processes
Optimization
Quantum mechanics
Qubits (quantum computing)
关联动力学
初始状态
耗散
软测量
过程优化
量子相关性
量子纠缠
马尔可夫环境
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ISSN1674-1056
2058-3834
1741-4199
DOI10.1088/1674-1056/24/4/044205

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Summary:We investigate the protection of quantum correlations of two qubits in independent vacuum reservoirs by means of weak measurements. It is found that the weak measurement can reduce the amount of quantum correlation for one type of initial state at the beginning in a non-Markovian environment and meanwhile it can reduce the occurrence time of entanglement sudden death （ESD） in the process of time evolution. In a Markovian environment, the quantum entanglements of the two kinds of initial states decay rapidly and the weak measurement can further weaken the quantum entanglement, therefore in this case the entanglement cannot be optimized in the evolution process.
Bibliography:quantum entanglement, quantum correlation, entanglement sudden death, weak measurement
We investigate the protection of quantum correlations of two qubits in independent vacuum reservoirs by means of weak measurements. It is found that the weak measurement can reduce the amount of quantum correlation for one type of initial state at the beginning in a non-Markovian environment and meanwhile it can reduce the occurrence time of entanglement sudden death （ESD） in the process of time evolution. In a Markovian environment, the quantum entanglements of the two kinds of initial states decay rapidly and the weak measurement can further weaken the quantum entanglement, therefore in this case the entanglement cannot be optimized in the evolution process.
11-5639/O4
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ISSN:1674-1056
2058-3834
1741-4199
DOI:10.1088/1674-1056/24/4/044205