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Efficient, high rate photon sources with high single photon purity areessential ingredients for quantum technologies. Single photon sources based onsolid state emitters such as quantum dots are very advantageous for integratedphotonic circuits, but they can suffer from a high two-photon emissionprobability, which in cases of non-cryogenic environment cannot be spectrallyfiltered. Here we propose two temporal purification-by-heralding methods forusing a two photon emission process to yield highly pure and efficient singlephoton emission, bypassing the inherent problem of spectrally overlappingbi-photon emission. We experimentally demonstrate their feasibility on theemission from a single nanocrystal quantum dot, exhibiting single photonpurities exceeding 99.5%, without a significant loss of single photonefficiency. These methods can be applied for any indeterministic source ofspectrally broadband photon pairs.

Purification of single photons by temporal heralding of quantum dot sources