Contextuality and Quantum Discord

TL;DR

This paper compares contextuality and quantum discord in two-qubit states, revealing that while non-discordant states are non-contextual, discordant states can be either contextual or non-contextual, highlighting nuanced differences in quantum correlations.

Contribution

It provides a comparative analysis of contextuality and quantum discord, clarifying their relationship in quantum correlations of two-qubit states.

Findings

Non-discordant states are non-contextual

Discordant states are not always contextual

Highlights nuanced differences in quantum correlations

Abstract

One of the defining differences between classical and quantum systems is how measurements affect them. Here, we compare the approaches of contextuality and quantum discord in capturing quantum correlations in special classes of two-qubit states, demonstrating that although non-discordant states are non-contextual, discordant states are not always contextual.