Additivity of the Classical Capacity of Entanglement-Breaking Quantum Channels

Abstract

We show that for the tensor product of an entanglement-breaking quantum channel with an arbitrary quantum channel, both the minimum entropy of an output of the channel and the Holevo-Schumacher-Westmoreland capacity are additive. In addition, for the tensor product of two arbitrary quantum channels, we give a bound involving entanglement of formation for the amount of subadditivity (for minimum entropy output) or superadditivity (for channel capacity) that can occur.

7 pages, minor corrections and clarifications in version 3

References in corpus (1)

• Maximization of capacity and p-norms for some product channels

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