Details

Autor(en) / Beteiligte

• Radhakrishnan, Chandrashekar
• Laurière, Mathieu
• Byrnes, Tim

Titel

Multipartite Generalization of Quantum Discord

Ist Teil von

• Physical review letters, 2020-03, Vol.124 (11), p.110401-110401, Article 110401

Ort / Verlag

United States: American Physical Society

Erscheinungsjahr

2020

Link zum Volltext

Quelle

PROLA

Beschreibungen/Notizen

• 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.