Assisted state discrimination without entanglement

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	Assisted state discrimination without entanglement
	Li, B ; Fei, SM ; Wang, ZX ; Fan, H
刊名	PHYSICAL REVIEW A
	2012
卷号	85 期号:2
关键词	QUANTUM STATES
ISSN号	1050-2947
通讯作者	Li, B: Chinese Acad Sci, Inst Phys, Beijing 100190, Peoples R China.
中文摘要	It is shown that the dissonance, a quantum correlation which is equal to quantum discord for separable state, is required for assisted optimal state discrimination. We find that only one side discord is required in the optimal process of assisted state discrimination, while another side discord and entanglement is not necessary. We confirm that the quantum discord, which is asymmetric depending on local measurements, is a resource for assisted state discrimination. With the absence of entanglement, we give the necessary and sufficient condition for vanishing one side discord in assisted state discrimination for a class of d nonorthogonal states. As a by-product, we find that the positive-partial-transposition condition is the necessary and sufficient condition for the separability of a class of 2 x d states.
收录类别	SCI
资助信息	NSFC; "973" program [2010CB922904]; [PHR201007107]
语种	英语
公开日期	2013-09-17
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/33990]
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	Li, B,Fei, SM,Wang, ZX,et al. Assisted state discrimination without entanglement[J]. PHYSICAL REVIEW A,2012,85(2).
APA	Li, B,Fei, SM,Wang, ZX,&Fan, H.(2012).Assisted state discrimination without entanglement.PHYSICAL REVIEW A,85(2).
MLA	Li, B,et al."Assisted state discrimination without entanglement".PHYSICAL REVIEW A 85.2(2012).