Towards scalable, stable neutral-atom qubit control based on full photonic integration

Scalable neutral-atom quantum computing requires precise, stable, and high-speed optical control of large qubit arrays. However, current free-space optical addressing architectures are fundamentally limited in footprint, environmental stability, and parallelization. Photonic integrated circuits (PICs) based on thin-film lithium niobate provide a promising path toward compact, reproducible, and broadband optical modulation at visible wavelengths. In this work, we present the design and optimization of lithium-niobate waveguide structures for efficient light routing around 556 nm, a wavelength central to Ytterbium-Rydberg-based quantum computing platforms. The PIC enables active calibration and on-chip stabilization of the optical power by compensating thermal and electrical drifts significantly improving long-term operational stability. First results support the development of compact, multi-channel optical control modules capable of scaling to hundreds or thousands of individually addressable atomic qubits, and are broadly applicable to quantum computing, quantum networking, and precision photonic sensing systems.