Due to some ambiguity in the definition of mutual Tsallis entropy in classical probability theory, its generalization to quantum theory is discussed. We define a q-discord derived from the q-expectation value of mutual Tsallis entropy. We provide analytical expressions for q-discord for two-qubit Werner states as well as for isotropic states and we show that both are positive, at least for states under investigation, for all q > 0.
展开▼
