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We demonstrate a nanophotonic parametric light source with a record highnormalized conversion efficiency of $3\times 10^6\, W^{-2}$, owing toresonantly enhanced four wave mixing in coupled high-Q photonic crystalresonators. The rate of spontaneously emitted photons reaches 14 MHz.

Triply-resonant Continuous Wave Parametric Source with a Microwatt Pump