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We report the generation of high-purity twin photon pairs throughcavity-enhanced non-degenerate four-wave mixing (FWM) in a high-Q siliconmicrodisk resonator. Twin photon pairs are created within the same cavity modeand are consequently expected to be identical in all degrees of freedom. Thedevice is able to produce twin photons at telecommunication wavelengths with apair generation rate as large as $(3.96\pm0.03)\times10^5 ~{\rm pairs/s}$,within a narrow bandwidth of 0.72 GHz. A coincidence-to-accidental ratio of$660\pm62$ was measured, the highest value reported to date for twin photonpairs, at a pair generation rate of $(2.47\pm0.04)\times10^4 ~{\rm pairs/s}$.Through careful engineering of the dispersion matching window, we have reducedthe ratio of photons resulting from degenerate FWM to non-degenerate FWM toless than 0.15.

Twin photon pairs in a high-Q silicon microresonator