Extremal Quantum Correlations: Experimental Study with Two-qubit States

TL;DR

This paper experimentally investigates the space of two-qubit quantum correlated states, focusing on frontier states defined by quantum discord and entropy, and compares different measures of quantum correlations.

Contribution

It provides an experimental exploration of two-qubit states including frontier states and compares quantum discord with alternative correlation measures.

Findings

Experimental generation of a wide variety of two-qubit states

Quantitative analysis of quantum discord versus alternative measures

Insights into the structure of quantum correlations in mixed states

Abstract

We explore experimentally the space of two-qubit quantum correlated mixed states, including frontier ones as defined by the use of quantum discord and von Neumann entropy. Our experimental setup is flexible enough to allow for the high-quality generation of a vast variety of states. We address quantitatively the relation between quantum discord and a recently suggested alternative measure of quantum correlations.