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.
@article{arxiv.quant-ph/0202130,
title = {Direct Measurement of the Photon Statistics of a Triggered Single Photon Source},
author = {F. Treussart and R. Alleaume and V. Le Floc'h and L. T. Xiao and J. -M Courty and J. -F. Roch},
journal= {arXiv preprint arXiv:quant-ph/0202130},
year = {2009}
}