

Preprint 66/2018
Coherence generating power of unitary transformations via probabilistic average
Lin Zhang, Zhi-Hao Ma, Zhi-Hua Chen, and Shao-Ming Fei
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Submission date: 20. Aug. 2018
Pages: 18
published in: Quantum information processing, 17 (2018) 7, art-no. 186
DOI number (of the published article): 10.1007/s11128-018-1928-4
Bibtex
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Abstract:
We study the ability of a quantum channel to generate quantum
coherence when it applies to incoherent states. Based on
probabilistic averages, we define a measure of such coherence
generating power (CGP) for a generic quantum channel, based on the
average coherence generated by the quantum channel acting on a
uniform ensemble of incoherent states. Explicit analytical formula
of the CGP for any unitary channels are presented in terms of
subentropy. An upper bound for CGP of unital quantum channels has
been also derived. Detailed examples are investigated.