Homodyne detection of non-Gaussian quantum steering

TL;DR

This paper introduces a Fisher information-based homodyne detection protocol to certify non-Gaussian quantum steering in continuous-variable states, overcoming limitations of Gaussian-based methods and enhancing experimental feasibility.

Contribution

It presents a novel steering witness protocol applicable to non-Gaussian states using homodyne detection, expanding the toolkit for quantum correlation certification.

Findings

Effective detection of non-Gaussian steering where Gaussian methods fail

Protocol applicable to general continuous-variable bipartite states

Enhances experimental feasibility of quantum steering certification

Abstract

Quantum correlations are at the core of current developments in quantum technologies. Certification protocols of entanglement and steering, suitable for continuous-variable non-Gaussian states are scarce and generally highly demanding from an experimental point of view. We propose a protocol based on Fisher information for witnessing steering in general continuous-variable bipartite states, through homodyne detection. It proves to be relevant for the detection of non-Gaussian steering in scenarios where witnesses based on Gaussian features like the covariance matrix are shown to fail.