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In the same silicon photonic integrated circuit, we compare two types ofintegrated degenerate photon-pair sources (microring resonators or waveguides)by means of Hong-Ou-Mandel (HOM) interference experiments. Two nominallyidentical microring resonators are coupled to two nominally identicalwaveguides which form the arms of a Mach-Zehnder interferometer. This is pumpedby two lasers at two different wavelengths to generate by spontaneous four-wavemixing degenerate photon pairs. In particular, the microring resonators can bethermally tuned in or out of resonance with the pump wavelengths, thus choosingeither the microring resonators or the waveguides as photon-pair sources,respectively. In this way, an on-chip HOM visibility of 94% with microringresonators and 99% with straight waveguides is measured. We compare ourexperimental results with theoretical simulations of the joint spectralintensity and the purity of the degenerate photon pairs. We verify that thevisibility is connected to the sources' indistinguishability, which can bequantified by the overlap between the joint spectral amplitudes (JSA) of thephoton pairs generated by the two sources. We estimate a JSA overlap of 98%with waveguides and 89% with microring resonators.

Have different kinds of photon-pair sources the same indistinguishability in quantum silicon photonics?