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下相干的子关性-华东师范大学
4 ( ) No. 4
2016 7 Journal of East China Normal University (Natural Science) Jul. 2016
: 1000-5641(2016)04-0111-07
( , 200062)
: (Entangled Coherent State, ECS)
. (Entanglement of Formation, E) (Quantum
Discord, QD) (Measurement-Induced Disturbance, MID)
(Geometric Measure of Quantum Discord, GQD)
, r , 0,
r 0,
. , (Bell)
, .
: ; ;
: O043 : A DOI: 10.3969/j.issn.1000-5641.2016.04.013
The quantum correlation evolution properties of
entangled coherent states in noisy environments
YANG Zhi-gang
(State Key Laboratory of Precision Spectroscopy in Science and Technology,
East China Normal University, Shanghai 200062, China)
Abstract: In this paper, quantum correlation in an entangled coherent state (ECS) is
extensively studied with four popular quantifiers, namely, entanglement of formation (E),
quantum discord (QD), measurement-induced disturbance (MID) and geometric measure
of quantum discord (GQD). Besides, the influence of amplitude damping noises on the
quantum correlation is treated. It is found that, E decreases faster than QD.E (QD or
MID) behaves quite similarly in an asymmetric and a symmetric noisy channel. What’s
more, it is obvious that the Bell state is not always more entangled than the ECS.
Key words: entangled coherent state; amplitude damping channel; quantum
correlation
: 2015-06
: ;
(2011CB921602, 2012CB821302)
: , , , . E-mail: 779052316@.
112
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