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Updated: Aug 24, 2026

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Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
Published on: May 30, 2014
Direct observation of nonclassical photon statistics in parametric down-conversion
Edo Waks1, Eleni Diamanti, Barry C Sanders
1Quantum Entanglement Project, ICORP, JST, E. L. Ginzton Laboratories, Stanford University, Stanford, California 94305, USA.
Physical Review Letters
|April 20, 2004
Abstract:
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.

