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Moreover, this probability can be bounded simply from an auto-correlation measurement \u2014 a balanced beam splitter and two photon detectors. Such a bound gives access to various non-classicality witnesses that can be used to certify and quantify Wigner-negativity, in addition to non-Gaussianity and P-negativity of the state produced by the source. We provide tools that can be used in practice to account for an imperfect beam splitter, non-identical and non-unit detection efficiencies, dark counts and other imperfections, take finite statistical effects into account without assuming that identical states are produced in all rounds, and optionally allow one to remove the detector inefficiencies from the analysis. We demonstrate the use of the proposed benchmark, non-classicality witness and measure using a heralded single-photon source based on spontaneous parametric down-conversion. We report on an average probability that a single photon is produced <mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\"><mml:mo>&amp;#x2265;<\/mml:mo><mml:mn>55<\/mml:mn><mml:mi mathvariant=\"normal\">&amp;#x0025;<\/mml:mi><\/mml:math> and an average measure of the Wigner negativity <mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\"><mml:mo>&amp;#x2265;<\/mml:mo><mml:mn>0.004<\/mml:mn><\/mml:math> with a confidence level of <mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\"><mml:mn>1<\/mml:mn><mml:mo>&amp;#x2212;<\/mml:mo><mml:msup><mml:mn>10<\/mml:mn><mml:mrow class=\"MJX-TeXAtom-ORD\"><mml:mo>&amp;#x2212;<\/mml:mo><mml:mn>10<\/mml:mn><\/mml:mrow><\/mml:msup><\/mml:math>.<\/jats:p>","DOI":"10.22331\/q-2022-12-13-875","type":"journal-article","created":{"date-parts":[[2022,12,13]],"date-time":"2022-12-13T17:09:55Z","timestamp":1670951395000},"page":"875","update-policy":"http:\/\/dx.doi.org\/10.22331\/q-crossmark-policy-page","source":"Crossref","is-referenced-by-count":4,"title":["Benchmarking single-photon sources from an auto-correlation measurement"],"prefix":"10.22331","volume":"6","author":[{"given":"Pavel","family":"Sekatski","sequence":"first","affiliation":[{"name":"Department of Applied Physics, University of Geneva, Geneva, Switzerland"}]},{"given":"Enky","family":"Oudot","sequence":"additional","affiliation":[{"name":"ICFO - Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology, 08860 Castelldefels (Barcelona), Spain"}]},{"given":"Patrik","family":"Caspar","sequence":"additional","affiliation":[{"name":"Department of Applied Physics, University of Geneva, Geneva, Switzerland"}]},{"given":"Rob","family":"Thew","sequence":"additional","affiliation":[{"name":"Department of Applied Physics, University of Geneva, Geneva, Switzerland"}]},{"given":"Nicolas","family":"Sangouard","sequence":"additional","affiliation":[{"name":"Universit\u00e9 Paris-Saclay, CEA, CNRS, Institut de physique th\u00e9orique, 91191, Gif-sur-Yvette, France"}]}],"member":"9598","published-online":{"date-parts":[[2022,12,13]]},"reference":[{"key":"0","doi-asserted-by":"publisher","unstructured":"M. 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