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

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

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.

Keywords: super-quantum discord (SQD) weak measurement control

Received: 29 April 2015
Revised: 31 July 2015
Accepted manuscript online:

PACS:	03.65.Ta	(Foundations of quantum mechanics; measurement theory)
	03.65.Ud	(Entanglement and quantum nonlocality)
	03.67.-a	(Quantum information)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 11264015).

Corresponding Authors: Ji Ying-Hua
E-mail: jyh2006@jxnu.edu.cn

Cite this article:

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

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

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