Amending Coherence-Breaking Channels via Unitary Operations |
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| Authors: | Long-Mei Yang Bin Chen Tao Li Shao-Ming Fei Zhi-Xi Wang |
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| Institution: | 1.School of Mathematical Sciences,Capital Normal University,Beijing,China;2.School of Mathematical Sciences,Tianjin Normal University,Tianjin,China;3.School of Science, Beijing Technology and Business University,Beijing,China |
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| Abstract: | 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 Φ, 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 Φ that are not coherence-breaking ones, we consider the mapping Φ °Φ and present the conditions for coherence-breaking and channel amendment as well. |
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