Simple direct measurement of nonclassical joint signal-idler photon-number statistics and correlation area of twin photon beams
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areacorrelationjointmeasurementphoton-numbersignal-idlerbeamscamera
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The measurement of joint signal-idler photon-number distribution of a field obtained from spontaneous parametric downconversion using an intensified CCD camera is presented. It is shown that a classicality criterion is violated directly by the measured data. Characteristic dimensions of the area of correlation are determined in the same experimental setup.
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