Towards the Integrated Quantum Photonic Circuits—The Development of the Nonlinear and Quantum Photonic Devices in Quasi-Phase-Matched Nonlinear Waveguides

This is a project that devotes to the exploration of the state-of-the-art technology for developing advanced nonlinear and quantum devices potential for integrated quantum photonic circuits and various applications. Three core technologies are to be developed to realize the proposed nonlinear and quantum devices. They are a quasi-phase-matched (QPM) spontaneous parametric down-conversion (SPDC) waveguide technology for efficient entangled photon-pair generation, a broadband, high-adiabaticity directional coupling technology for performing a counterintuitive light transfer of the generated entangled photons, and a QPM cascaded quadratic nonlinear switching modeling technology based on an adiabatic directional coupler system.I propose in the first project year the development of the design and fabrication technology for demonstrating an ultra-broadband and high-adiabaticity waveguide coupler in LiNbO3, in the second project year, the proof-of-principle demonstration of a pump-filtered entangled photon-pair generation source based on a QPM nonlinear adiabatic waveguide device, and finally in the third project year, the study of a high working bandwidth all-optical switch based on cascaded quadratic adiabatic couplers.Though nonlinear and quantum science and technology are relatively new and fundamental subjects, the PI believes they are one of the most valuable topics that we should focus on and invest in because they are key technologies for building next-generation information processing and computing systems. The accomplishment of this project is hopefully to promote the scientific and industrial competitiveness on research and development of relevant fields.