Work

Geometric quantum discord with Bures distance

Year: 2013

Type: article

Abstract: We define a new measure of quantum correlations in bipartite quantum systems given by the Bures distance of the system state to the set of classical states with respect to one subsystem, that is, to the states with zero quantum discord. Our measure is a geometrical version of the quantum discord. As the latter it quantifies the degree of non-classicality in the system. For pure states it is identical to the geometric measure of entanglement. We show that for mixed states it coincides with the optimal success probability of an ambiguous quantum state discrimination task. Moreover, the closest zero-discord states to a state ρ are obtained in terms of the corresponding optimal measurements.

Source: New Journal of Physics

DOI: 10.1088/1367-2630/15/10/103001

Authors: D Spehner, M Orszag

Institutions: Centre National de la Recherche Scientifique, Laboratoire de Physique et Modélisation des Milieux Condensés, Institut Fourier, Pontificia Universidad Católica de Chile

Language: English

Topic: Quantum Information and Cryptography

Subfield: Artificial Intelligence

Field: Computer Science

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $2,610

Funder: Agence Nationale de la Recherche