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A quantum dot can be used as a source of one- and two-photon states and ofpolarisation entangled photon pairs. The emission of such states isinvestigated from the point of view of frequency-resolved two-photoncorrelations. These follow from a spectral filtering of the dot emission, whichcan be achieved either by using a cavity or by placing a number of interferencefilters before the detectors. The combination of these various options is usedto iteratively refine the emission in a "distillation" process and arrive athighly correlated states with a high purity. So-called "leapfrog processes"where the system undergoes a direct transition from the biexciton state to theground state by direct emission of two photons, are shown to be central to thequantum features of such sources. Optimum configurations are singled out in aglobal theoretical picture that unifies the various regimes of operation.

Distilling one, two and entangled pairs of photons from a quantum dot with cavity QED effects and spectral filtering