Entropic measures of nonclassical correlations

TL;DR

This paper introduces a framework for classifying and analyzing entropic measures of nonclassical correlations in bipartite quantum states, exploring their properties and evaluating them on two-qubit systems.

Contribution

It presents a unified framework for entropic measures of nonclassical correlations, analyzing their properties and applying them to two-qubit states for the first time.

Findings

Many measures have been proposed previously.

Properties of these measures are systematically explored.

Evaluation results for two-qubit states are provided.

Abstract

A framework for categorizing entropic measures of nonclassical correlations in bipartite quantum states is presented. The measures are based on the difference between a quantum entropic quantity and the corresponding classical quantity obtained from measurements on the two systems. Three types of entropic quantities are used, and three different measurement strategies are applied to these quantities. Many of the resulting measures of nonclassical correlations have been proposed previously. Properties of the various measures are explored, and results of evaluating the measures for two-qubit quantum states are presented.