Theoretical insights on measuring quantum correlations

TL;DR

This paper reviews a theoretical approach for experimentally detecting and quantifying quantum correlations in bipartite systems, emphasizing a measure that avoids full state tomography and discussing practical implementations.

Contribution

It introduces a new measure Q for quantifying quantum correlations in 2 x d systems without full state reconstruction, applicable to various experimental setups.

Findings

The measure Q can quantify quantum correlations efficiently.

The approach is adaptable to NMR and optical experiments.

Extensions to open system dynamics are discussed.

Abstract

We review a recently developed theoretical approach to the experimental detection and quantification of bipartite quantum correlations between a qubit and a d dimensional system. Specifically, introducing a properly designed measure Q, the presented scheme allows us to quantify general quantum correlations for arbitrary states of 2 x d systems without the need to fully reconstruct them by tomographic techniques. We take in exam the specifics of the required experimental architecture in nuclear magnetic resonance and optical settings. Finally we extend this approach to models of open system dynamics and discuss possible advantages and limitations in such a context.