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.
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页数：8
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