Observable estimation of entanglement of formation and quantum discord for bipartite mixed quantum states

被引：19

作者：

Zhang, Chengjie ^{[1
]}

Yu, Sixia ^{[1
,2
,3
]}

Chen, Qing ^{[1
,2
,3
]}

Oh, C. H. ^{[1
]}

机构：

[1] Natl Univ Singapore, Ctr Quantum Technol, Singapore 117543, Singapore

[2] Univ Sci & Technol China, Hefei Natl Lab Phys Sci Microscale, Hefei 230026, Anhui, Peoples R China

[3] Univ Sci & Technol China, Dept Modern Phys, Hefei 230026, Anhui, Peoples R China

来源：

PHYSICAL REVIEW A | 2011年 / 84卷 / 05期

基金：

新加坡国家研究基金会;

关键词：

D O I：

10.1103/PhysRevA.84.052112

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We present observable lower and upper bounds for the entanglement of formation (EOF) and quantum discord (QD), which facilitates estimates of EOF and QD for arbitrary experimental unknown states in finite-dimensional bipartite systems. These bounds can be easily obtained by a few experimental measurements on a twofold copy (sic) circle times (sic) of the mixed states. Based on our results, we use the experimental measurement data of the real experiment given by Schmid et al. [Phys. Rev. Lett. 101, 260505 (2008)] to obtain the lower and upper bounds of EOF and QD for the experimental unknown state.

引用

页数：8

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