Direct Measurement of the Photon Statistics of a Triggered Single Photon Source
F. Treussart, R. Alleaume, V. Le Floc'h, L. T. Xiao, J. -M Courty, J. -F. Roch
Abstract
We studied intensity fluctuations of a single photon source relying on the pulsed excitation of the fluorescence of a single molecule at room temperature. We directly measured the Mandel parameter Q(T) over 4 orders of magnitude of observation timescale T, by recording every photocount. On timescale of a few excitation periods, subpoissonian statistics is clearly observed and the probablility of two-photons events is 10 times smaller than Poissonian pulses. On longer times, blinking in the fluorescence, due to the molecular triplet state, produces an excess of noise.
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