Nonadditivity effects in classical capacities of quantum multiple-access channels

Details Nonadditivity effects in classical capacities of quantum multiple-access channels Nonadditivity effects in classical capacities of quantum multiple-access channels

2008-07-24

arxiv.org/abs/0807.3977v1

Physics

Quantum Physics

5 pages, 5 figures

Scientific paper

We study classical capacities of quantum multi-access channels in geometric terms revealing breaking of additivity of Holevo-like capacity. This effect is purely quantum since, as one points out, any classical multi-access channels have their regions additive. The observed non-additivity in quantum version presented here seems to be the first effect of this type with no additional resources like side classical or quantum information (or entanglement) involved. The simplicity of quantum channels involved resembles butterfly effect in case of classical channel with two senders and two receivers.

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