Global effects of quantum states induced by locally invariant measurements

doi:10.1209/0295-5075/92/20004

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	Global effects of quantum states induced by locally invariant measurements
	Luo, Shunlong1,2 ; Fu, Shuangshuang 2
	2010-10-01
发表期刊	EPL
ISSN	0295-5075
卷号	92 期号:2 页码:5
摘要	In quantum mechanics, general measurements often cause disturbance which may be exploited to quantify entanglement, nonlocality or quantumness. Imagine a bipartite state rho(ab) shared by two parties a and b, and a von Neumann measurement performed locally on party a which does not disturb the local state rho(a) := tr (b)rho(ab), but nevertheless may disturb the global state rho(ab). This disturbance is an indication of some kind of correlations or global effect in rho(ab) which cannot be accounted for locally. We propose to use the maximum disturbance on rho(ab) caused by locally non-disturbing measurements as a figure of merit quantifying the global effect (nonlocality), and investigate its fundamental properties. For general two-qubit states and some higher-dimensional symmetric states, we present analytic formulas for their global effects. Copyright (C) EPLA, 2010
DOI	10.1209/0295-5075/92/20004
语种	英语
资助项目	NSFC[10771208] ; Key Lab of Random Complex Structures and Data Science, CAS[2008DP173182]
WOS研究方向	Physics
WOS类目	Physics, Multidisciplinary
WOS记录号	WOS:000284470600004
出版者	EPL ASSOCIATION, EUROPEAN PHYSICAL SOCIETY
引用统计
文献类型	期刊论文
条目标识符	http://ir.amss.ac.cn/handle/2S8OKBNM/10497
专题	应用数学研究所
通讯作者	Luo, Shunlong
作者单位	1.Univ Bielefeld, Fak Math, D-33615 Bielefeld, Germany 2.Chinese Acad Sci, Acad Math & Syst Sci, Beijing 100190, Peoples R China
推荐引用方式 GB/T 7714	Luo, Shunlong,Fu, Shuangshuang. Global effects of quantum states induced by locally invariant measurements[J]. EPL,2010,92(2):5.
APA	Luo, Shunlong,&Fu, Shuangshuang.(2010).Global effects of quantum states induced by locally invariant measurements.EPL,92(2),5.
MLA	Luo, Shunlong,et al."Global effects of quantum states induced by locally invariant measurements".EPL 92.2(2010):5.