Discord Derived from Tsallis Entropy
arXiv:1206.0241
Abstract
Due to some ambiguity in defining mutual Tsallis entropy in the classical probability theory, its generalization to quantum theory is discussed and, as a consequence, two types of generalized quantum discord, called -discords, are defined in terms of quantum Tsallis entropy. -discords for two-qubit Werner and isotropic states are calculated and it is shown that one of them is positive, at least for states under investigation, for all . Finally, an analytical expression for -discord of certain family of two-qubit X states is presented.
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