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It is a fundamental challenge in quantum optics to deterministically generateindistinguishable single photons through non-deterministic nonlinear opticalprocesses, due to the intrinsic coupling of single- and multi-photon generationprobabilities in these processes. Actively multiplexing photons generated inmany temporal modes can decouple these probabilities, but key issues are tominimize resource requirements to allow scalability, and to ensureindistinguishability of the generated photons. We demonstrate the multiplexingof photons from four temporal modes solely using fiber-integrated optics andoff-the-shelf electronic circuits. We show a 100% enhancement to the singlephoton output probability without introducing additional multi-photon noise.Photon indistinguishability is confirmed by a four-fold Hong-Ou-Mandel quantuminterference with a 91% visibility. Our demonstration paves the way forscalable multiplexing of many non-deterministic photon sources to a singlenear-deterministic source, which will be of benefit to future quantum photonictechnologies.

Active Temporal Multiplexing of Indistinguishable Heralded Single Photons