Witnessing quantum steering by means of the Fisher information

TL;DR

This paper experimentally demonstrates how quantum steering can be witnessed through Fisher information, linking quantum correlations to metrological performance, and compares this method with existing approaches.

Contribution

It provides the first experimental validation of quantum steering detection via Fisher information, expanding the tools for quantum correlation characterization.

Findings

Quantum steering can be witnessed using Fisher information.

The Fisher information approach is effective and comparable to existing methods.

Experimental results confirm the theoretical predictions of Yadin, Fadel, and Gessner.

Abstract

Capturing specific kinds of quantum correlation is of paramount importance for quantum networking. Different routes can be taken to achieve this task, highlighting different novel aspects of such quantum correlations. Following the recent theoretical results by Yadin, Fadel and Gessner [Nat. Commun. 12, 2410 (2021)], we demonstrate experimentally how steering manifests in the metrological abilities of a bipartite state. Our results confirm the relevance of this novel approach, and compare the outcome with already employed alternatives.