3 research outputs found
The minimum entropy output of a quantum channel is locally additive
We show that the minimum von-Neumann entropy output of a quantum channel is
locally additive. Hasting's counterexample for the additivity conjecture, makes
this result quite surprising. In particular, it indicates that the
non-additivity of the minimum entropy output is a global effect of quantum
channels.Comment: Shorter Version, further simplifications of proof