For every Rényi order p<1/4 or p>3/4, some finite-dimensional quantum channels have non-additive minimum output p-Rényi entropy.
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Counterexamples to additivity of minimum output $p$-R\'enyi entropy of quantum channels for $p>3/4$ and $0\leq p<1/4$
For every Rényi order p<1/4 or p>3/4, some finite-dimensional quantum channels have non-additive minimum output p-Rényi entropy.