Preprint 7/2019

Amending coherence-breaking channels via unitary operations

Long-Mei Yang, Bin Chen, Shao-Ming Fei, and Zhi-Xi Wang

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Submission date: 09. Jan. 2019
Pages: 10
published in: International journal of theoretical physics, 57 (2018) 12, p. 3776-3784 
DOI number (of the published article): 10.1007/s10773-018-3890-4
Bibtex
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Abstract:
The coherence-breaking channels play a significant role in quantum information theory. We study the coherence-breaking channels for qubit systems and give a method to amend the coherence-breaking channels by applying unitary operations. For given incoherent channel Φ, we give a necessary and sufficient condition for the channel to be a coherence-breaking channel and amend it via unitary operations. For incoherent channels Φ that are not coherence-breaking ones, we consider Φ Φ and give the conditions for coherence-breaking and channel amendment as well.

02.11.2019, 02:18