Non-Gaussianity of a quantum state equals the correlation its two copies generate at a 50:50 beam splitter, enabling a state-agnostic, sample-efficient measurement via SWAP tests.
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Measuring non-Gaussianity with Correlation
Non-Gaussianity of a quantum state equals the correlation its two copies generate at a 50:50 beam splitter, enabling a state-agnostic, sample-efficient measurement via SWAP tests.