Unifying Treatment of Discord via Relative Entropy

TL;DR

This paper introduces a systematic approach to characterize zero-discord quantum states using Petz's monotonicity of relative entropy, generalizing symmetric zero-discord states and exploring their physical implications.

Contribution

It presents a new systematic derivation of zero-discord states based on relative entropy and extends the concept to symmetric cases with physical insights.

Findings

Derived a new form of zero-discord states using Petz's monotonicity condition

Generalized symmetric zero-discord states

Discussed physical implications of these states

Abstract

A new form of zero-discord state via Petz's monotonicity condition on relative entropy with equality has been derived systematically. A generalization of symmetric zero-discord states is presented and the related physical implications are discussed.