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• W3105071941 abstract "New measures of multipartite entanglement are constructed based on two definitions of multipartite information and different methods of optimizing over extensions of the states. One is a generalization of the squashed entanglement where one takes the mutual information of parties conditioned on the state's extension and takes the infimum over such extensions. Additivity of the multipartite squashed entanglement is proved for both versions of the multipartite information which turn out to be related. The second one is based on taking classical extensions. This scheme is generalized, which enables to construct measures of entanglement based on the {it mixed convex roof} of a quantity, which in contrast to the standard convex roof method involves optimization over all decompositions of a density matrix rather than just the decompositions into pure states. As one of the possible applications of these results we prove that any multipartite monotone is an upper bound on the amount of multipartite distillable key. The findings are finally related to analogous results in classical key agreement." @default.
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• W3105071941 date "2009-07-01" @default.
• W3105071941 modified "2023-10-12" @default.
• W3105071941 title "Squashed Entanglement for Multipartite States and Entanglement Measures Based on the Mixed Convex Roof" @default.
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• W3105071941 doi "https://doi.org/10.1109/tit.2009.2021373" @default.
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