On estimating the output entropy of the tensor product of a phase-damping channel and an arbitrary channel

Authors:
G. G. Amosov
Affiliations:
Steklov Mathematical Institute, Russian Academy of Sciences, Moscow, Russia
Venue:
Problems of Information Transmission
Year:
2013

Citing 4
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Abstract

We obtain a lower estimate for the output entropy of a tensor product of the quantum phase-damping channel and an arbitrary channel. We show that this estimate immediately implies that strong superadditivity of the output entropy holds for this channel as well as for the quantum depolarizing channel.