Quantum discord: "discord" between the whole and its constituent

TL;DR

This paper offers new interpretations of quantum discord, viewing it as the difference in measurement effects between a local system and the entire quantum system, thereby unifying various perspectives on quantum correlations.

Contribution

It introduces a unified interpretation of quantum discord based on measurement-induced effects, expanding understanding beyond entanglement.

Findings

Quantum discord can be seen as the difference in measurement disturbance between local and whole systems.

Provides a unified view linking measurement-induced entanglement, decoherence, and discord.

Offers quantitative definitions to interpret quantum discord in terms of information gain.

Abstract

Quantum discord, a measure of quantum correlation beyond entanglement, is initially defined as the discord between two classically equivalent while quantum discordant definitions of mutual information. In this paper, we report some new interpretations of discord which rely on the differences between measurement induced effects on the local measured system and the whole system. Specifically, with proper quantitative definitions introduced in [Buscemi, Hayashi and Horodecki, Phys. Rev. Lett. 100, 2210504 (2008)], we find that quantum discord can be interpreted as the differences of measurement induced disturbance or information gain on the local measured system and on the whole system. Combined with previous similar results based on measurement induced entanglement and decoherence, our results provide a unified view on quantum discord.