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Uniform Quantification of Correlations for Bipartite Systems
Ting-Gui Zhang, Hong Yang, Xianqing Li-Jost and Shao-Ming Fei
Based on the relative entropy, we give a unified characterization of quantum correlations for nonlocality, steerability, discord and entanglement for any bipartite quantum states. For two-qubit states we show that the quantities obtained from quantifying nonlocality, steerabiity, entanglement and discord have strictly monotonic relationship. As for examples, the Bell diagonal states are studied in detail.