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Homodyne detection of non-Gaussian quantum steering
preprintposted on 2023-01-10, 02:26 authored by Carlos E. Lopetegui, Manuel Gessner, Matteo Fadel, Nicolas Treps, Mattia Walschaers
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.