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Multipartite Generalization of Quantum Discord. | LitMetric

Multipartite Generalization of Quantum Discord.

Phys Rev Lett

New York University Shanghai, 1555 Century Avenue, Pudong, Shanghai 200122, China.

Published: March 2020

AI Article Synopsis

Article Abstract

A generalization of quantum discord to multipartite systems is proposed. A key feature of our formulation is its consistency with the conventional definition of discord in bipartite systems. It is by construction zero only for systems with classically correlated subsystems and is a non-negative quantity, giving a measure of the total nonclassical correlations in the multipartite system with respect to a fixed measurement ordering. For the tripartite case, we show that the discord can be decomposed into contributions resulting from changes induced by nonclassical correlation breaking measurements in the conditional mutual information and tripartite mutual information. The former gives a measure of the bipartite nonclassical correlations and is a non-negative quantity, while the latter is related to the monogamy of the nonclassical correlations.

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Source
http://dx.doi.org/10.1103/PhysRevLett.124.110401DOI Listing

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