Super-quantum correlation and geometry for Bell-diagonal states with weak measurements

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	Super-quantum correlation and geometry for Bell-diagonal states with weak measurements
	Wang, YK ; Ma, T ; Fan, H ; Fei, SM ; Wang, ZX
刊名	QUANTUM INFORMATION PROCESSING
	2014
卷号	13 期号:2 页码:283
关键词	Weak measurement Weak one-way deficit Super-quantum correlation
ISSN号	1570-0755
通讯作者	Wang, ZX (reprint author), Capital Normal Univ, Sch Math Sci, Beijing 100048, Peoples R China.
中文摘要	We propose "weak one-way deficit" by weak measurements as the generalization of one-way deficit defined for standard projective measurements. The weak one-way deficit for Werner state is obtained analytically. We find that weak one-way deficit is smaller than the standard one-way deficit, which contrasts with a straightforward expectation based on the known fact that super-quantum discord by weak measurement is always larger than the quantum discord defined by projective measurement. On the other hand, by tuning the weak measurement continuously to the projective measurement, both weak one-way deficit and super-quantum discord converge to the same value, which is either the one-way deficit or the quantum discord both quantifying quantum correlation. In this sense, weak measurement does not necessarily capture more quantumness of correlations. We also give the geometry of super-quantum discord of the Bell-diagonal states with explicit geometrical figures. As an application, the dynamic behavior of super-quantum correlation including super-quantum discord and weak one-way deficit under decoherence is investigated. We find that the order relation of the super-quantum correlation and the quantum correlation remained unchanged under the phase flipping channel for the Bell-diagonal states and the Werner states.
资助信息	[NSFC11275131]; [KZ201210028032]
语种	英语
公开日期	2015-04-14
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/59627]
专题	物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文
推荐引用方式 GB/T 7714	Wang, YK,Ma, T,Fan, H,et al. Super-quantum correlation and geometry for Bell-diagonal states with weak measurements[J]. QUANTUM INFORMATION PROCESSING,2014,13(2):283.
APA	Wang, YK,Ma, T,Fan, H,Fei, SM,&Wang, ZX.(2014).Super-quantum correlation and geometry for Bell-diagonal states with weak measurements.QUANTUM INFORMATION PROCESSING,13(2),283.
MLA	Wang, YK,et al."Super-quantum correlation and geometry for Bell-diagonal states with weak measurements".QUANTUM INFORMATION PROCESSING 13.2(2014):283.