期刊
QUANTUM
卷 4, 期 -, 页码 -出版社
VEREIN FORDERUNG OPEN ACCESS PUBLIZIERENS QUANTENWISSENSCHAF
DOI: 10.22331/q-2020-04-02-249
关键词
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资金
- Spanish MINECO [IJCI-2015-24643, FIS2016-80681-P]
- AEI/FEDER funds
- Generalitat de Catalunya [CIRIT 2017-SGR-1127]
- ERC Synergy Grant BioQ
- Fundacion la Caixa [LCF/BQ/DE16/11570017]
- BaiduUAB collaborative project 'Learning of Quantum Hidden Markov Models'
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.
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