Issue |
EPL
Volume 107, Number 1, July 2014
|
|
---|---|---|
Article Number | 10007 | |
Number of page(s) | 6 | |
Section | General | |
DOI | https://doi.org/10.1209/0295-5075/107/10007 | |
Published online | 07 July 2014 |
Quantum correlation measure in arbitrary bipartite systems
1 School of Physics and Optoelectronic Technology, Dalian University of Technology - Dalian 116024, China
2 Zhejiang Institute of Modern Physics, Department of Physics, Zhejiang University - Hangzhou 310027, China
(a) quaninformation@sina.com
ycs@dlut.edu.cn
Received: 31 March 2014
Accepted: 16 June 2014
Quantum correlation with a novel definition is presented for an arbitrary bipartite quantum state in terms of the skew information of the complete set of rank-one orthogonal projectors. This definition not only inherits the good properties of skew information including the contractivity, but also shows a powerful analytic computability for a large range of states. In addition, the measure for a general state can be easily numerically obtained by the well-developed technique of the approximate joint diagonalization. As a comparison, we give both the analytic and the numerical quantum correlation for many high-dimensional states. The relation between our measure and quantum metrology is also analyzed.
PACS: 03.67.Mn – Entanglement measures, witnesses, and other characterizations / 03.65.Ud – Entanglement and quantum nonlocality (e.g. EPR paradox, Bell's inequalities, GHZ states, etc.) / 03.65.Ta – Foundations of quantum mechanics; measurement theory
© EPLA, 2014
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