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Phys Rev Lett. 2004 Mar 19;92(11):113602. Epub 2004 Mar 19.

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

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  • 1Quantum Entanglement Project, ICORP, JST, E. L. Ginzton Laboratories, Stanford University, Stanford, California 94305, USA.


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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