Quantum discord and multipartite correlations
Ma{\l}gorzata Okrasa, Zbigniew Walczak
TL;DR
This paper analyzes quantum and classical correlations in bipartite and multipartite systems using quantum discord, introducing a new measure of quantum correlations that is bounded by quantum discord.
Contribution
It provides a systematic analysis of correlations based on quantum discord and introduces a novel measure of quantum correlations.
Findings
Quantum discord can be interpreted as the minimal correlation loss due to local operations.
A new measure of quantum correlations is proposed, bounded below by quantum discord.
The analysis applies to both bipartite and multipartite quantum systems.
Abstract
Recently, it was realized that quantum discord can be seen as the minimal amount of correlations which are lost when some local quantum operations are performed. Based on this formulation of quantum discord, we provide a systematical analysis of quantum and classical correlations present in both bipartite and multipartite quantum systems. As a natural result of this analysis, we introduce a new measure of the overall quantum correlations which is lower bounded by quantum discord.
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