Classical and quantum correlative capacities of quantum systems

doi:10.1103/PhysRevA.84.042124

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	Classical and quantum correlative capacities of quantum systems
	Li, Nan; Luo, Shunlong
	2011-10-31
发表期刊	PHYSICAL REVIEW A
ISSN	1050-2947
卷号	84 期号:4 页码:4
摘要	How strongly can one system be correlated with another? In the classical world, this basic question concerning correlative capacity has a very satisfying answer: The "effective size" of the marginal system, as quantified by the Shannon entropy, sets a tight upper bound to the correlations, as quantified by the mutual information. Although in the quantum world bipartite correlations, like their classical counterparts, are also well quantified by mutual information, the similarity ends here: The correlations in a bipartite quantum system can be twice as large as the marginal entropy. In the paradigm of quantum discord, the correlations are split into classical and quantum components, and it was conjectured that both the classical and quantum correlations are ( like the classical mutual information) bounded above by each subsystem's entropy. In this work, by exploiting the interplay between entanglement of formation, mutual information, and quantum discord, we disprove that conjecture. We further indicate a scheme to restore harmony between quantum and classical correlative capacities. The results illustrate dramatically the asymmetric nature of quantum discord and highlight some subtle and unusual features of quantum correlations.
DOI	10.1103/PhysRevA.84.042124
语种	英语
资助项目	National Center for Mathematics and Interdisciplinary Sciences[Y029152K51]
WOS研究方向	Optics ; Physics
WOS类目	Optics ; Physics, Atomic, Molecular & Chemical
WOS记录号	WOS:000296328600004
出版者	AMER PHYSICAL SOC
引用统计
文献类型	期刊论文
条目标识符	http://ir.amss.ac.cn/handle/2S8OKBNM/11461
专题	应用数学研究所
通讯作者	Li, Nan
作者单位	Chinese Acad Sci, Acad Math & Syst Sci, Beijing 100190, Peoples R China
推荐引用方式 GB/T 7714	Li, Nan,Luo, Shunlong. Classical and quantum correlative capacities of quantum systems[J]. PHYSICAL REVIEW A,2011,84(4):4.
APA	Li, Nan,&Luo, Shunlong.(2011).Classical and quantum correlative capacities of quantum systems.PHYSICAL REVIEW A,84(4),4.
MLA	Li, Nan,et al."Classical and quantum correlative capacities of quantum systems".PHYSICAL REVIEW A 84.4(2011):4.