Seminarium Fizyki Materii Skondensowanej

We propose an information-theoretic quantifier for the advantage gained from cooperation that captures the degree of dependency between subsystems of a global system. The quantifier is distinct from measures of multipartite correlations despite sharing many properties with them. It is directly computable for classical as well as quantum systems and reduces to comparing the respective conditional mutual information between any two subsystems. Secret sharing provides an exemplary cooperation task where this quantifier is beneficial. Based on the new quantifier we prove an inequality characterizing the lack of monotonicity of conditional mutual information under local operations and provide intuitive understanding for it. Join Zoom Meeting https://us02web.zoom.us/j/83686899432? pwd=RXNtZkhtZFpLazVmMVRFY1BtVlI0Zz09 Meeting ID: 836 8689 9432Passcode: cond-matt