Correlation measures in bipartite states and entanglement irreversibility

TL;DR

This paper explores the relationships between various correlation measures in bipartite quantum states, providing bounds on entanglement irreversibility and conditions for reversibility, linking entanglement and discord properties.

Contribution

It introduces quantitative relations among correlation measures and establishes a connection between entanglement irreversibility and the additivity of quantum discord.

Findings

Derived bounds on entanglement irreversibility

Identified conditions for reversible entanglement

Linked additivity of entanglement of formation to quantum discord

Abstract

We derive quantitative relations among several naturally defined measures of classical and nonclassical correlations in a bipartite quantum state. We also obtain an upper bound of entanglement irreversibility and a sufficient condition for reversible entanglement. The additivity of entanglement of formation is directly related to the additivity of quantum discord as well as a certain measure of classical correlation.