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.
Kejie Fang received BS in physics from Peking University and PhD in physics from Stanford University (with Shanhui Fan). He then worked in Caltech as a postdoctoral researcher in the Department of Applied Physics and Material Science (with Oskar Painter). He is an Associate Professor and Y.T. Lo Faculty Fellow in the Department of Electrical and Computer Engineering and is affiliated with the Department of Physics. His research focuses on integrated photonics and devices for classical and quantum information processing, quantum sensing and quantum networking. He has received NSF CAREER Award.