مشخصات پژوهش

So far, super quantum discord has been calculated explicitly only for Bell-diagonal states and expressions for more general quantum states are not known. In this paper, we de- rive explicit expressions for super quantum discord for a larger class of two-qubit states, namely, a 4-parameter family of X-states. We observe that, weak measurements obtain more quantumness of correlations than strong measurements. As an application, the dy- namic behavior of the super quantum discord under decoherence channel is investigated. We find that, the super quantum discord decreases monotonically as a function of the measurement strength parameter.