Abstract
Nonlinear optics plays a crucial role in various scientific and technological fields. We introduce an emerging III-V nonlinear photonics platform based on indium gallium phosphide (InGaP), with a record-high nonlinearity-to-loss ratio. This enables nonlinear optical conversion efficiencies nearly two orders of magnitude higher than the current state of the art. Leveraging this high-performance platform, we achieve several unprecedented experimental results, including quantum frequency conversion with milliwatt-level pump power, generation of quantum correlations between photons via passive nonlinearity, and nonlinear-optical Bell state measurement based quantum teleportation at the single-photon level. These results have significant implications for advancing quantum information processing and quantum networking with integrated nonlinear photonic platforms.