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• W3003011640 abstract "It is well known that the quantum mutual information and its conditional version do not increase under local channels. I this paper we show that the recently established lower semicontinuity of the quantum conditional mutual information implies (in fact, is equivalent to) the lower semicontinuity of the loss of the quantum (conditional) mutual information under local channels considered as a function on the Cartesian product of the set of all states of a composite system and the sets of all local channels (equipped with the strong convergence). Some applications of this property are considered. New continuity conditions for the quantum mutual information and for the squashed entanglement in both bipartite and multipartite infinite-dimensional systems are obtained. It is proved, in particular, that the multipartite squashed entanglement of any countably-non-decomposable separable state with finite marginal entropies is equal to zero. Special continuity properties of the information gain of a quantum measurement with and without quantum side information are established that can be treated as robustness (stability) of these quantities w.r.t. perturbation of the measurement and the measured state." @default.
• W3003011640 created "2020-01-30" @default.
• W3003011640 creator A5017383854 @default.
• W3003011640 date "2021-07-01" @default.
• W3003011640 modified "2023-10-14" @default.
• W3003011640 title "On Lower Semicontinuity of the Quantum Conditional Mutual Information and Its Corollaries" @default.
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• W3003011640 doi "https://doi.org/10.1134/s008154382102019x" @default.
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