We theoretically demonstrate that Kerr nonlinearity in optical circuits can lead to both resonant four-wave mixing and photon blockade, which can be used for high-yield generation of high-fidelity individual photon pairs with conjugated frequencies. We propose an optical circuit, which, in the optimal pulsed-drive regime, would produce photon pairs at the rate up to 5 × 10 s (0.5 pairs per pulse) with g(0)<10 for one of the conjugated frequencies. We show that such a scheme can be utilised to generate colour-entangled photons.
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