Direct observation of nonclassical photon statistics in parametric down-conversion.

  title={Direct observation of nonclassical photon statistics in parametric down-conversion.},
  author={Edo Waks and Eleni Diamanti and Barry C. Sanders and Stephen D. Bartlett and Yoshihisa Yamamoto},
  journal={Physical review letters},
  volume={92 11},
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. 
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