Third-order antibunching from an imperfect single-photon source
Martin J. Stevens, Scott C. Glancy, Sae Woo Nam, Richard P. Mirin
We measure second- and third-order temporal coherences, g(2)(τ) and g(3)(τ1, τ2), of an optically excited single-photon source: an InGaAs quantum dot in a microcavity pedestal. Increasing the optical excitation power leads to an increase in the measured count rate, and also an increase in multi-photon emission probability. We show that standard measurements of g(2) provide limited information about this multi-photon probability, and that more information can be gained by simultaneously measuring g(3). Experimental results are compared with a simple theoretical model to show that the observed antibunchings are consistent with an incoherent addition of two sources: 1) an ideal single-photon source that never emits multiple photons and 2) a background cavity emission having Poissonian photon number statistics. Spectrally resolved cross-correlation measurements between quantum-dot and cavity modes show that photons from these two sources are largely uncorrelated, further supporting the model. We also analyze the Hanbury Brown-Twiss interferometer implemented with two or three "click" detectors, and explore the conditions under which it can be used to accurately measure g(2)(τ) and g(3)(τ1,τ2).
, Glancy, S.
, Nam, S.
and Mirin, R.
Third-order antibunching from an imperfect single-photon source, Optics Express, [online], https://doi.org/10.1364/OE.22.003244
(Accessed December 5, 2023)