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An on-demand single-photon source is a fundamental building block in quantumscience and technology. We experimentally demonstrate the proof of concept fora scheme to generate on-demand single photons via actively multiplexing severalheralded photons probabilistically produced from pulsed spontaneous parametricdown-conversions (SPDCs). By utilizing a four-photon-pair source, an activefeed-forward technique, and an ultrafast single-photon router, we show afourfold enhancement of the output photon rate. Simultaneously, we maintain thequality of the output single-photon states, confirmed by correlationmeasurements. We also experimentally verify, via Hong-Ou-Mandel interference,that the router does not affect the indistinguishability of the single photons.Furthermore, we give numerical simulations, which indicate that photons basedon multiplexing of four SPDC sources can outperform the heralding based onhighly advanced photon-number-resolving detectors. Our results show a route foron-demand single-photon generation and the practical realization of scalablelinear optical quantum information processing.

Experimental generation of single photons via active multiplexing