Optimizing quantum correlation dynamics by weak measurement in dissipative environment

doi:10.1088/1674-1056/24/4/044205

Abstract 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.

Keywords: quantum entanglement quantum correlation entanglement sudden death weak measurement

Received: 22 September 2014
Revised: 15 October 2014
Accepted manuscript online:

PACS:	42.50.Dv	(Quantum state engineering and measurements)
	42.50.Nn	(Quantum optical phenomena in absorbing, amplifying, dispersive and conducting media; cooperative phenomena in quantum optical systems)
	42.50.Pq	(Cavity quantum electrodynamics; micromasers)
	42.50.Wk	(Mechanical effects of light on material media, microstructures and particles)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 61178012 and No.11147019).

Corresponding Authors: Xia Yun-Jie
E-mail: yjxia_sd@126.com

Cite this article:

Du Shao-Jiang (杜少将), Xia Yun-Jie (夏云杰), Duan De-Yang (段德洋), Zhang Lu (张路), Gao Qiang (高强) Optimizing quantum correlation dynamics by weak measurement in dissipative environment 2015 Chin. Phys. B 24 044205

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