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Set Coherence: Basis-Independent Quantification of Quantum Coherence




TekijätDesignolle Sébastien, Uola Roope, Luoma Kimmo, Brunner Nicolas

KustantajaAMER PHYSICAL SOC

Julkaisuvuosi2021

JournalPhysical Review Letters

Tietokannassa oleva lehden nimiPHYSICAL REVIEW LETTERS

Lehden akronyymiPHYS REV LETT

Artikkelin numeroARTN 220404

Vuosikerta126

Numero22

Sivujen määrä6

ISSN0031-9007

DOIhttps://doi.org/10.1103/PhysRevLett.126.220404


Tiivistelmä
The coherence of an individual quantum state can be meaningfully discussed only when referring to a preferred basis. This arbitrariness can, however, be lifted when considering sets of quantum states. Here we introduce the concept of set coherence for characterizing the coherence of a set of quantum systems in a basis-independent way. We construct measures for quantifying set coherence of sets of quantum states as well as quantum measurements. These measures feature an operational meaning in terms of discrimination games and capture precisely the advantage offered by a given set over incoherent ones. Along the way, we also connect the notion of set coherence to various resource-theoretic approaches recently developed for quantum systems.



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