Nonadditivity of quantum and classical capacities for entanglement breaking multiple-access channels and butterfly network

Details Nonadditivity of quantum and classical capacities for entanglement breaking multiple-access channels and butterfly network Nonadditivity of quantum and classical capacities for entanglement breaking multiple-access channels and butterfly network

2009-06-06

arxiv.org/abs/0906.1305v2

Phys. Rev. A 81, 060305(R) (2010)

Physics

Quantum Physics

Accepted for publication in Phys. Rev. A as a Rapid Communication

Scientific paper

10.1103/PhysRevA.81.060305

We analyze quantum network primitives which are entanglement-breaking. We show superadditivity of quantum and classical capacity regions for quantum multiple-access channel and 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. To our knowledge the present effects provide the first qualitative borderline between superadditivities of bipartite and multipartite systems.

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