Entanglement as minimal discord over state extensions

doi:10.1103/PhysRevA.94.032129

CSpace > 应用数学研究所

	Entanglement as minimal discord over state extensions
	Luo, Shunlong1,2
	2016-09-29
发表期刊	PHYSICAL REVIEW A
ISSN	2469-9926
卷号	94 期号:3 页码:6
摘要	The characterization and quantification of quantum correlations, which play an instrumental role in exploring and exploiting the quantum world, have been extensively and intensively studied in the past few decades. Of special prominence and significance are the concepts of entanglement and discord, which are usually regarded as very distinctive quantum correlations, with the latter going beyond the former. In this work we establish a direct and natural link between entanglement and discord via state extensions and reveal that entanglement is actually the intrinsic discord, by which we mean that entanglement is the irreducible residue of discord viewed from ambient spaces. Our approach, taking into account the contextuality of a quantum state and being of a global nature, stands in sharp contrast to the local operations and classical communication paradigm of entanglement, which focuses on the state itself via a local approach. Furthermore, we introduce a figure of merit which, on the one hand, captures the essence of entanglement, i.e., nonlocality and quantumness of correlations, and, on the other hand, leads to a quantitative decomposition of total correlations into classical correlations, dissonance, and entanglement. This demystifies the meaning of entanglement from the perspective of quantum measurements and provides a unified framework for the interplay of various correlations in terms of quantum measurements and mutual information.
DOI	10.1103/PhysRevA.94.032129
语种	英语
资助项目	National Natural Science Foundation of China[11375259] ; National Natural Science Foundation of China[61134008] ; National Center for Mathematics and Interdisciplinary Sciences, CAS[Y029152K51] ; IQC, University of Waterloo, Canada
WOS研究方向	Optics ; Physics
WOS类目	Optics ; Physics, Atomic, Molecular & Chemical
WOS记录号	WOS:000384372600002
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/23636
专题	应用数学研究所
通讯作者	Luo, Shunlong
作者单位	1.Chinese Acad Sci, Acad Math & Syst Sci, Beijing 100190, Peoples R China 2.Univ Chinese Acad Sci, Sch Math Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Luo, Shunlong. Entanglement as minimal discord over state extensions[J]. PHYSICAL REVIEW A,2016,94(3):6.
APA	Luo, Shunlong.(2016).Entanglement as minimal discord over state extensions.PHYSICAL REVIEW A,94(3),6.
MLA	Luo, Shunlong."Entanglement as minimal discord over state extensions".PHYSICAL REVIEW A 94.3(2016):6.