Photon emission from a single molecule at room temperature exhibits nonclassical features. Continuous wave fluorescence excitation provides antibunching in the emitted photons sequence as a signature of the property to only emit one photon at a time. A short pulsed excitation can then produce single photons on demand, with an overall quantum efficiency up to 4.5% in our experimental setup. Direct measurement of the Mandel parameter Q(T) for an observation period of duration T follows a subpoissonian statistics on short time scale and superpoissonian statistics on longer time scale. The latter is attributed to blinking in the fluorescence due to the occurence of a metastable molecular triplet state. © 2002 Académie des sciences/Éditions scientifiques et médicales Elsevier SAS.
Treussart, F., Alleéaume, R., Le Floc’h, V., & Roch, J. F. (2002). Single photon emission from a single molecule. Comptes Rendus Physique, 3(4), 501–508. https://doi.org/10.1016/S1631-0705(02)01331-2