Homodyne Detection of Non-Gaussian Quantum Steering
Carlos E. Lopetegui, Manuel Gessner, Matteo Fadel, Nicolas Treps, Mattia Walschaers · PRX Quantum · 2022
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.