Experimental quantification of quantum coherence for a set of quantum states

Abstract:We present a direct experimental verification of quantum coherence for a set of quantum states in a basis-independent manner. We find that the theory of quantum coherence for a set of quantum states matches our experimental results perfectly and can be applied to protocols like BB84 and quantum secure direct communication. Using a Sagnac interferometer, we experimentally quantify the quantum coherence for two sets of experimental states. Moreover, we introduce a novel application of set coherence, illustrating that the states employed in the BB84 protocol exhibit maximal set coherence. Our results pave the way for wider applications of quantum coherence for a set of quantum states, including quantum key distribution protocols and probabilistic quantum cloning.

arXiv:2610.01227 [quant-ph]

(or arXiv:2610.01227v1 [quant-ph] for this version)

https://doi.org/10.48550/arXiv.2610.01227 Focus to learn more arXiv-issued DOI via DataCite (pending registration)

Phys. Rev. A 111, 042426 (2025)

https://doi.org/10.1103/PhysRevA.111.042426 Focus to learn more DOI(s) linking to related resources

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