Journal
JOURNAL OF PHYSICS A-MATHEMATICAL AND GENERAL
Volume 38, Issue 45, Pages L753-L758Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0305-4470/38/45/L02
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We prove a lemma which allows one to extend results about the additivity of the minimal output entropy from highly symmetric channels to a much larger class. A similar result holds for the maximal output p-norm. Examples are given showing its use in a variety of situations. In particular, we prove the additivity and the multiplicativity for the shifted depolarizing channel.
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