Superadiabatic topological pumping on photonic chips.

Adiabatic topological pumping offers a robust mechanism for light transport in integrated photonics, enabling the development of efficient on-chip photonic devices. However, its practical implementations face significant challenges in maintaining both high transport efficiency and scalability due to slow adiabatic modulation requirements, and existing acceleration strategies fall short in achieving substantial device miniaturization. Here, we develop a gap-mode strategy for constructing shortcut to topological pumping, and experimentally demonstrate a superadiabatic paradigm through iterative adiabatic transformations in an on-chip photonic platform. Our approach achieves a 20-fold footprint reduction compared to conventional adiabatic pumping and a 50% size reduction relative to optimized Landau-Zener (as well as recently reported quantum metric and adiabatic infimum) implementations. The device operates over a remarkable bandwidth of 650-920 nm while facilitating scalable waveguide integration. This methodology establishes a framework for realizing high-efficiency topological photonic transport with tailored coupling configurations, paving the way for ultra-compact photonic integrated circuits.