Infleqtion and Partners Develop Chip-Scale Optical Cavity for Quantum Tech

Infleqtion, Honeywell Aerospace, and UC Santa Barbara have collaboratively developed a chip-scale integrated optical cavity prototype designed to shrink lasers and optical stabilization systems for quantum technologies. The prototype is aimed at applications in quantum sensors, optical atomic clocks, and neutral-atom quantum processing units (QPUs).

The optical cavity was engineered by Infleqtion’s team alongside Professor Daniel J. Blumenthal’s Optical Communications and Photonic Integration (OCAQπ) Group at UCSB. It was fabricated using Honeywell Aerospace’s silicon nitride (Si3N4) photonic integration foundry process. This advancement replaces bulky, tabletop optical cavities with chip-scale solutions, enabling mass production in commercial semiconductor foundries.

The prototype leverages photonic intellectual property from SiNoptiq, a UCSB spin-off acquired by Infleqtion in 2024. By integrating narrow-linewidth laser stabilization directly onto silicon nitride chips, the collaboration paves the way for field-deployable quantum systems. These include atomic timing devices, quantum-enhanced inertial navigation, and compact neutral-atom quantum computers.

Target applications for this technology range from handheld quantum sensors and RF receivers to quantum optical clocks and neutral-atom QPUs. Potential uses extend to GPS-denied precision navigation, timing for telecommunication cell towers, and data centers.