Title: "Quantum nonlinear photonics with applications in quantum networking."
Interaction between individual photons forms the foundation of gate-based optical quantum computing among other quantum-enabled technologies. Quantum emitter-mediated photon interactions are fundamentally constrained by stringent operation conditions and the available photon wavelength and bandwidth, posing difficulty in upscaling and practical applications. It is a long-standing goal to realize interactions between individual photons using the more engineerable bulk optical nonlinearity, such as chi2 and chi3. Dr. Fang will describe the first observation of photon-photon interaction mediated by a virtual photon in an integrated photonic circuit with a substantial chi2 nonlinearity and the resulting quantum correlations of transported photons including photon repulsion and attraction. These results represent a significant leap in nonlinear optics and quantum photonics, transcending the longtime paradigm of parametric nonlinear processes and paving the way towards strongly interacting photons in bulk nonlinear systems. Moreover, Dr. Fang will talk about using such an integrated photonic platform with extreme nonlinearity for nonlinearity-enabled quantum network protocols.