Accessible coherence in open quantum system dynamics
| Autor: | Benjamin Desef, Dario Egloff, Andrea Smirne, Michaelis Skotiniotis, Susana F. Huelga, John Calsamiglia, Matteo Rosati, María García Díaz |
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| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Quantum Physics
Physics and Astronomy (miscellaneous) Computer science Propagator FOS: Physical sciences 01 natural sciences lcsh:QC1-999 Atomic and Molecular Physics and Optics 010305 fluids & plasmas 81P40 Open quantum system Qubit 0103 physical sciences Quantum system Statistical physics 010306 general physics Quantum Physics (quant-ph) Quantum Finite set lcsh:Physics Coherence (physics) |
| Zdroj: | Quantum, Vol 4, p 249 (2020) |
| Popis: | 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. 6+4 pages, 2 figures, comments welcome, accepted for publication in Quantum |
| Databáze: | OpenAIRE |
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