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Quantifying nonclassical correlations relative to local channels
Cong Xu, Tao Li, Ruonan Ren, Ming-Jing Zhao, Shao-Ming Fei·November 10, 2025
Quantum Physics
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Abstract
Nonclassical correlations are significant physical resources with extensive applications in quantum information processing. We introduce the modified Wigner-Yanase-Dyson skew information of a quantum state relative to a quantum channel, and a quantitative measure of quantum correlations. Their basic properties are explored in detail. Through a specific example, we also compare our correlations measure with the existing one. Moreover, the correlations relative to various channels including the von Neumann measurements, the unitary channels and the twirling channels are analyzed.