Quantumness of bipartite states in terms of conditional entropies

doi:10.1088/1751-8113/40/37/012

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	Quantumness of bipartite states in terms of conditional entropies
	Li, Nan; Luo, Shunlong; Zhang, Zhengmin
	2007-09-14
发表期刊	JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL
ISSN	1751-8113
卷号	40 期号:37 页码:11361-11371
摘要	Quantum discord, as defined by Olliver and Zurek ( 2002 Phys. Rev. Lett. 88 017901) as the difference of two natural quantum extensions of the classical mutual information, plays an interesting role in characterizing quantumness of correlations. Inspired by this idea, we will study quantumness of bipartite states arising from different quantum analogs of the classical conditional entropy. Our approach is intrinsic, in contrast to the Olliver - Zurek method that involves extrinsic local measurements. For this purpose, we introduce two alternative variants of quantum conditional entropies via conditional density operators, which in turn are intuitive quantum extensions of equivalent classical expressions for the conditional probability. The significance of these quantum conditional entropies in characterizing quantumness of bipartite states is illustrated through several examples.
DOI	10.1088/1751-8113/40/37/012
语种	英语
WOS研究方向	Physics
WOS类目	Physics, Multidisciplinary ; Physics, Mathematical
WOS记录号	WOS:000249223100014
出版者	IOP PUBLISHING LTD
引用统计
文献类型	期刊论文
条目标识符	http://ir.amss.ac.cn/handle/2S8OKBNM/5186
专题	应用数学研究所
通讯作者	Li, Nan
作者单位	1.Chinese Acad Sci, Acad Math & Syst Sci, Beijing 100080, Peoples R China 2.Carleton Univ, Dept Math & Stat, Ottawa, ON K1S 5B6, Canada
推荐引用方式 GB/T 7714	Li, Nan,Luo, Shunlong,Zhang, Zhengmin. Quantumness of bipartite states in terms of conditional entropies[J]. JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL,2007,40(37):11361-11371.
APA	Li, Nan,Luo, Shunlong,&Zhang, Zhengmin.(2007).Quantumness of bipartite states in terms of conditional entropies.JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL,40(37),11361-11371.
MLA	Li, Nan,et al."Quantumness of bipartite states in terms of conditional entropies".JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL 40.37(2007):11361-11371.