Hierarchy of efficiently computable and faithful lower bounds to quantum discord

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Piani, Marco (2016) Hierarchy of efficiently computable and faithful lower bounds to quantum discord. Physical Review Letters, 117 (8). 080401. ISSN 1079-7114 (https://doi.org/10.1103/PhysRevLett.117.080401)

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Abstract

Quantum discord expresses a fundamental non-classicality of correlations that is more general than entanglement, but that, in its standard definition, is not easily evaluated. We derive a hierarchy of computationally efficient lower bounds to the standard quantum discord. Every non-trivial element of the hierarchy constitutes by itself a valid discord-like measure, based on a fundamental feature of quantum correlations: their lack of shareability. Our approach emphasizes how the difference between entanglement and discord depends on whether shareability is intended as a static property or as a dynamical process.

ORCID iDs

Piani, Marco ORCID logoORCID: https://orcid.org/0000-0002-4698-9497;
CORE (COnnecting REpositories)