This example demonstrates how to model a realistic photon source and use it as input to qINTERCONNECT. The photon generation rate and wavefunction are calculated for a Type-I SPDC process in a localized segment of length L with a chi^{(2)} nonlinearity in a straight waveguide, where pump photons are converted to pairs of signal and idler photons such that energy conservation and phase matching conditions are satisfied. Interference between photons from two independent sources is demonstrated for identical and non-identical sources.
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