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We demonstrate Hong-Ou-Mandel interference between different transverse spatial modes in a silicon nitride multimode waveguide. We show over 90% visibility between modes, providing a promising route for scalable on-chip quantum information processing.
We show approaches for achieving CMOS compatible on-chip isolators. The devices are achieved by inducing photonic GHz electro-optic transitions on a time scale faster than the photon time of flight in the structure.
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