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.
Institut für Theoretische Physik, Universität Innsbruck, Institut für Quantenoptik und Quanteninformation, Osterreichischen Akademie der Wissenschaften, Innsbruck, Austria.
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Dür
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Cirac
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Horodecki