Direct Observation of Nonclassical Photon Statistics in Parametric Down-Conversion
Edo Waks, Eleni Diamanti, Barry Cyril Sanders, Stephen D. Bartlett, Y. Yamamoto · Physical Review Letters · 2004
We employ a high quantum efficiency photon number counter to determine the photon number distribution of the output field from a parametric down-converter. The raw photocount data directly demonstrates that the source is nonclassical by 40 standard deviations, and correcting for the quantum efficiency yields a direct observation of oscillations in the photon number distribution.