Constructive counterexamples to additivity of minimum output Rényi entropy of quantum channels for all p>2

preprint2010arXivOpen access

Abstract

We present a constructive example of violation of additivity of minimum output Rényi entropy for each p>2. The example is provided by antisymmetric subspace of a suitable dimension. We discuss possibility of extension of the result to go beyond p>2 and obtain additivity for p=0 for a class of entanglement breaking channels.

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