Recent advances in nanofabrication technology have allowed for the realization of ultra-low loss nanophotonic waveguides and is opening up exciting opportunities for next-generation nonlinear photonic circuits with higher integration density, advanced functionalities, and ultralow energy consumption. Those features are critical for advancing photonic technologies in both classical and quantum domains.

In this talk, I will discuss silicon-based and thin-film lithium niobate (LN)-based photonic devices, which leverage the combination of Kerr and second-order nonlinearities, along with electro-optic (EO) and piezoelectric effects to achieve highly efficient and controllable light-matter interactions with optical, electrical, or mechanical waves at extremely compact footprints. I will talk about the first mode-locked Kerr frequency combs and ultrafast spectroscopic device in the mid-infrared regime, based on silicon microresonators. Furthermore, I will discuss a novel class of silicon-nitride-based optical parametric oscillators and its experimental realization for building a true quantum random number generator and a spatially multiplexed nanophotonic spin glasses system for coherent photonic computing. Thirdly, I will talk about the emerging LN optoelectronic platform and show the developments of several novel EO devices and circuits for optical non-reciprocity, femtosecond pulse lasers, frequency-shifters, and electro-optic frequency combs. Combination of multiple nonlinearities of LN also enables ultrabroadband optical spectral generation from ultraviolet to mid-infrared. Lastly, I will discuss the potential of nonlinear photonic platform for scaling up and accelerating classical and quantum technologies in single-photon sources and manipulation, photonic computing, communication networks, and information processing.