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Composite optical systems can show compelling collective dynamics. Forinstance, the cooperative decay of quantum emitters into a common radiationmode can lead to superradiance, where the emission rate of the ensemble islarger than the sum of the rates of the individual emitters. Here, we reportexperimental evidence of super spontaneous four-wave mixing (super SFWM), ananalogous effect for the generation of photon pairs in a parametric nonlinearprocess on an integrated photonic device. We study this phenomenon in an arrayof microring resonators on a silicon photonic chip coupled to bus waveguides.We measured a cooperative pair generation rate that always exceeds theincoherent sum of the rates of the individual resonators. We investigate thephysical mechanisms underlying this collective behaviour, clarify the impact ofloss, and address the aspects of fundamental and technological relevance of ourresults.

Super spontaneous four-wave mixing in an array of silicon microresonators