Experimental test of quantum non-Gaussianity of heralded single photon state

TL;DR

This paper experimentally verifies the quantum non-Gaussian nature of a heralded single photon state with a positive Wigner function, demonstrating it cannot be represented as a mixture of Gaussian states using standard photon anti-correlation measurements.

Contribution

It provides the first experimental demonstration that a heralded single photon with positive Wigner function exhibits quantum non-Gaussianity, confirmed through a straightforward measurement.

Findings

Confirmed quantum non-Gaussianity of the photon state

Demonstrated the state cannot be decomposed into Gaussian mixtures

Used standard photon anti-correlation measurement for verification

Abstract

We report on experimental verification of quantum non-Gaussianity of a heralded single photon state with positive Wigner function. We unambiguously demonstrate that the generated state cannot be expressed as a mixture of Gaussian states. A sufficient information to witness the quantum non-Gaussianity is obtained from a standard photon anti-correlation measurement.