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Accessible coherence in open quantum system dynamics
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DOI：10.22331/q-2020-04-02-249.png)
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Quantum coherence generated in a physical process can only be cast as a potentially useful resource if its effects can be detected at a later time. Recently, the notion of non-coherence-generating-and-detecting (NCGD) dynamics has been introduced and related to the classicality of the statistics associated with sequential measurements at different times. However, in order for a dynamics to be NCGD, its propagators need to satisfy a given set of conditions for all triples of consecutive times. We reduce this to a finite set of d(d - 1) conditions, where d is the dimension of the quantum system, provided that the generator is time-independent. Further conditions are derived for the more general time-dependent case. The application of this result to the case of a qubit dynamics allows us to elucidate which kind of noise gives rise to non-coherence-generation-and-detection.
Keyword:
EQUATION
期刊
IF:
5.4
论文数:
951
被引数:
1.0W
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NATURE COMMUNICATIONS
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NATURE COMMUNICATIONSIF15.7
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