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Integrated photonics has emerged as one of the most promising platforms forquantum applications. The performances of quantum photonic integrated circuits(QPIC) necessitate a demanding optimization to achieve enhanced properties andtailored characteristics with more stringent requirements with respect to theirclassical counterparts. In this study, we report on the simulation,fabrication, and characterization of a series of fundamental components forphotons manipulation in QPIC based on silicon nitride. These include crossingwaveguides, multimode-interferometer-based integrated beam splitters (MMIs),asymmetric integrated Mach-Zehnder interferometers (MZIs) based on MMIs, andmicro-ring resonators. Our investigation revolves primarily around the Visibleto Near-Infrared spectral region, as these devices are meticulously designedand tailored for optimal operation within this wavelength range. By advancingthe development of these elementary building blocks, we aim to pave the way forsignificant improvements in QPIC in a spectral region only little explored sofar.

SiN integrated photonic components in the Visible to Near-Infrared spectral region