Nonadditivity of quantum and classical capacities for entanglement breaking multiple-access channels and the butterfly network
Andrzej Grudka, Paweł Horodecki · Physical Review A · 2010
We analyze quantum network primitives which are entanglement breaking. We show superadditivity of quantum and classical capacity regions for quantum multiple-access channels and the quantum butterfly network. Since the effects are especially visible at high noise they suggest that quantum information effects may be particularly helpful in the case of the networks with occasional high noise rates. The present effects provide a qualitative borderline between superadditivities of bipartite and multipartite systems.