2013/09/30 by Chang-shui Yu, Shao-xiong Wu, Xiaoguang Wang +3
Computer Science · Physics and Astronomy · #Bipartite graph #Measure (data warehouse) #Quantum #Quantum Computing Algorithms and Architecture #Quantum Information and Cryptography #Quantum and electron transport phenomena #Quantum correlation #Quantum discord #Quantum system #Relation (database) #Skew #State (computer science) #quant-ph
paper · pdf · doi:10.1209/0295-5075/107/10007
published as 2014 EPL 107 10007 · 6 pages, 2 figures. Comments are welcome
arxiv created 2013/10/09 · openalex publication_date 2014/07/01 · arxiv updated 2015/06/17 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
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.