Quantum Partial Information Decompositions, an Operational Order on Ensembles, and Direct Quantifications of Objective Information

Abstract:The partial information decomposition (PID) framework is an extension of classical information theory that enables a systematic analysis of the structure of information in multipartite systems. We advance a simple extension of this framework enabling the construction of multipartite quantum PIDs (QPIDs); generalizing recent, exclusively bipartite, extensions. We construct two QPIDs of the Holevo quantity. First a naive QPID based on the classical minimum mutual information. Second a sophisticated QPID enabled by our development of an operational partial order on quantum ensembles in terms of ensemble (inter-)convertability. Finally, as a concrete example of how QPIDs can be applied, we investigate objectivity scenarios; using our Holevo QPIDs to directly quantify objective information in extended graph states. These findings ultimately establish a foundation upon which generic multipartite QPIDs can be systematically constructed, introduce an operational partial order on ensembles, advance QPIDs as interesting objects of study in their own right, and demonstrate their immediate applicability to problems in quantum information.

arXiv:2610.20694 [quant-ph]

(or arXiv:2610.20694v1 [quant-ph] for this version)

https://doi.org/10.48550/arXiv.2610.20694 Focus to learn more arXiv-issued DOI via DataCite (pending registration)

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