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Quantum non-Gaussian Depth of Single-Photon States

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arxiv 1403.4194 v2 pith:NULCBMIQ submitted 2014-03-17 quant-ph

Quantum non-Gaussian Depth of Single-Photon States

Ivo Straka , Ana Predojevi\'c , Tobias Huber , Luk\'a\v{s} Lachman , Lorenz Butschek , Martina Mikov\'a , Michal Mi\v{c}uda , Glenn S. Solomon
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Gregor Weihs Miroslav Je\v{z}ek Radim Filip
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classification quant-ph
keywords depthquantumsingle-photonnon-gaussianexperimentallyfunctionsignificantstates
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We introduce and experimentally explore the concept of quantum non-Gaussian depth of single-photon states with a positive Wigner function. The depth measures the robustness of a single-photon state against optical losses. The directly witnessed quantum non-Gaussianity withstands significant attenuation, exhibiting a depth of 18 dB, while the nonclassicality remains unchanged. Quantum non-Gaussian depth is an experimentally approachable quantity that is much more robust than the negativity of the Wigner function. Furthermore, we use it to reveal significant differences between otherwise strongly nonclassical single-photon sources.

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