Nonadditivity of quantum capacity for multiparty communication channels.
We investigate multiparty communication scenarios where information is sent from several senders to several receivers. We establish a relation between the quantum capacity of multiparty communication channels and their distillability properties, which enables us to show that the quantum capacity of such channels is not additive.
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Institut für Theoretische Physik, Universität Innsbruck, Institut für Quantenoptik und Quanteninformation, Osterreichischen Akademie der Wissenschaften, Innsbruck, Austria.
Cirac
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Horodecki
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