科研之友
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摘要
The coherence-breaking channels play a significant role in quantum information theory. We study the coherence-breaking channels and give a method to amend the coherence-breaking channels by applying unitary operations. For given incoherent channel phi, we give necessary and sufficient conditions for the channel to be a coherence-breaking channel and amend it via unitary operations. For qubit incoherent channels phi that are not coherence-breaking ones, we consider the mapping phi o phi and present the conditions for coherence-breaking and channel amendment as well.
