Tunable statistics of multicolor photons emitted from semiconducting quantum dots

We report the intensity auto- and cross-correlation functions of two consecutively emitted photons from an optically excited single semiconductor quantum dot. We show that a quantum dot is not only a source of non-classically correlated monochromatic photons but is also a source of multicolor photons with excitation power dependent correlation properties. We found that the emitted photon statistics is evolving, as the excitation power is increased, from a sub-Poissonian statistics, where the photons are temporally antibunched, to a super-Poissonian one, where they are temporally bunched.