# Field-programmable Photonic Nonlinearity #paper https://www.nature.com/articles/s41566-025-01660-x Field-programmable photonic nonlinearity is a technology that allows the dynamic and precise control of nonlinear optical responses within integrated photonic devices. Developed by Tianwei Wu, Yankun Li, Li Ge, and Liang Feng, this approach enables in situ training and reconfiguration of photonic networks, making it possible to implement complex activation functions commonly used in artificial intelligence. This innovation extends the programmability of photonic systems beyond the linear domain, offering new possibilities for efficient and flexible Reconfigurable computing.