Tailoring photon emission statistics of a single quantum box for quantum communications

We have obtained quantum states of light from the emission of an isolated InAs quantum dot. Single photon emission is observed via correlation experiments. Moreover, cross-correlation experiments reveal the sequential de-excitation of the quantum dot, yielding a radiative cascade that produces two single photons with a definite order. These quantum states of light can be generated with a high quantum efficiency, which opens the way to the design of a source, that can deliver both true single photons and strongly correlated photon pairs.