A new sufficient criterion certifies quantum non-Gaussianity from g2 and g3 alone: observing sqrt(g3) + 3 sqrt(g2) < 2 proves the state is not a mixture of Gaussian states; a quantum-dot source violates it by 0.174(13) vs 2.
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A Quantum Non-Gaussianity Criterion Based on Photon Correlations $g^{(2)}$ and $g^{(3)}$
A new sufficient criterion certifies quantum non-Gaussianity from g2 and g3 alone: observing sqrt(g3) + 3 sqrt(g2) < 2 proves the state is not a mixture of Gaussian states; a quantum-dot source violates it by 0.174(13) vs 2.