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The third-order non-linearity of silicon gives rise to a spontaneousfour-wave mixing process in which correlated photon pairs are generated.Sources based on this effect can be used for quantum computation andcryptography, and can in principle be integrated with standard CMOS fabricationtechnology and components. However, one of the major challenges is the on-chipdemultiplexing of the photons, and in particular the filtering of the pumppower, which is many orders of magnitude larger than that of the signal andidler photons. Here, we propose a photonic crystal coupled-cavity systemdesigned so that the coupling of the pump mode to the output channel isstrictly zero due to symmetry. We further analyze this effect in presence offabrication disorder and find that, even then, a pump suppression of close to40 dB can be achieved in state-of-the art systems. Due to the small modevolumes and high quality factors, our system is also expected to have ageneration efficiency much higher than in standard micro-ring systems. Thosetwo considerations make a strong case for the integration of our proposeddesign in future on-chip quantum technologies.

A compact, integrated silicon device for the generation of spectrally-filtered, pair-correlated photons