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
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