Scaling trapped-ion quantum computers to solve practical problems requires dense, broadband, and fabrication-compatible optical interfaces. Current photonic integrated circuit (PIC) approaches are limited by per-device optical bandwidth, restricting achievable ion densities. We present a monolithically integrated quantum photonic platform for trapped-ion control that leverages additive manufacturing to enable scalable three-dimensional optical routing. Our device integrates waveguides and microscale printed focusing elements directly with a surface-electrode ion trap. We experimentally validate multi-wavelength operation by performing spectroscopy on the 729 nm quadrupole transition of 40Ca+, and repumping at 866 nm and 455 nm for 40Ca+ and 138Ba+, respectively. The fabricated next-generation architecture incorporates a gate zone and a cache zone to support modular scaling. The gate zone enables individual optical addressing of a 7-qubit register, achieving an average any-to-any crosstalk below −30 dB at 729 nm with 6.5 µm ion spacing. The cache zone supports broadband delivery to qubit pairs for parallel operations. The monolithic trap–PIC integration, combined with microscale additive dielectric shielding, is designed to mitigate photoinduced charging while preserving optical performance. Our architecture establishes a scalable path toward high-density trapped-ion quantum systems.
Project currently funded by: Federal