Dynamics of super-quantum discord and direct control with weak measurement in open quantum system

doi:10.1088/1674-1056/24/12/120302

中国物理B ›› 2015, Vol. 24 ›› Issue (12): 120302-120302.doi: 10.1088/1674-1056/24/12/120302

Dynamics of super-quantum discord and direct control with weak measurement in open quantum system

嵇英华^{a b}

a Department of Physics, Jiangxi Normal University, Nanchang 330022, China;
b Key Laboratory of Photoelectronics and Telecommunication of Jiangxi Province, Nanchang 330022, China

收稿日期:2015-04-29 修回日期:2015-07-31 出版日期:2015-12-05 发布日期:2015-12-05
通讯作者: Ji Ying-Hua E-mail:jyh2006@jxnu.edu.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No. 11264015).

Dynamics of super-quantum discord and direct control with weak measurement in open quantum system

Ji Ying-Hua (嵇英华)^{a b}

a Department of Physics, Jiangxi Normal University, Nanchang 330022, China;
b Key Laboratory of Photoelectronics and Telecommunication of Jiangxi Province, Nanchang 330022, China

Received:2015-04-29 Revised:2015-07-31 Online:2015-12-05 Published:2015-12-05
Contact: Ji Ying-Hua E-mail:jyh2006@jxnu.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No. 11264015).

摘要/Abstract

摘要： Super-quantum discord (SQD) with weak measurement is regarded as a kind of quantum correlation in quantum information processing. We compare and analyze the dynamical evolutions of SQD, quantum discord (QD), and quantum entanglement (QE) between two qubits in the correlated dephasing environmental model. The results indicate that (i) owing to the much smaller influence of weak measurement on the coherence of the system than that of von Neumann projection measurement, SQD with weak measurement is larger than QD, and (ii) dynamical evolution of QD or QE monotonically goes to zero with time, while SQD monotonically tends to a stable value and a freezing phenomenon occurs. The stable value after freezing mainly depends on the measurement strength and the purity of the initial quantum state.

关键词: super-quantum discord (SQD), weak measurement, control

Abstract: Super-quantum discord (SQD) with weak measurement is regarded as a kind of quantum correlation in quantum information processing. We compare and analyze the dynamical evolutions of SQD, quantum discord (QD), and quantum entanglement (QE) between two qubits in the correlated dephasing environmental model. The results indicate that (i) owing to the much smaller influence of weak measurement on the coherence of the system than that of von Neumann projection measurement, SQD with weak measurement is larger than QD, and (ii) dynamical evolution of QD or QE monotonically goes to zero with time, while SQD monotonically tends to a stable value and a freezing phenomenon occurs. The stable value after freezing mainly depends on the measurement strength and the purity of the initial quantum state.

Key words: super-quantum discord (SQD), weak measurement, control

中图分类号: (Foundations of quantum mechanics; measurement theory)

03.65.Ta

03.65.Ud (Entanglement and quantum nonlocality) 03.67.-a (Quantum information)

嵇英华. Dynamics of super-quantum discord and direct control with weak measurement in open quantum system[J]. 中国物理B, 2015, 24(12): 120302-120302.

Ji Ying-Hua (嵇英华). Dynamics of super-quantum discord and direct control with weak measurement in open quantum system[J]. Chin. Phys. B, 2015, 24(12): 120302-120302.

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Dynamics of super-quantum discord and direct control with weak measurement in open quantum system

Dynamics of super-quantum discord and direct control with weak measurement in open quantum system

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