Infleqtion, Honeywell Aerospace, and UC Santa Barbara Develop Chip-Scale Silicon Nitride Optical Cavity for Handheld Quantum Hardware
Infleqtion, in partnership with Honeywell Aerospace and UC Santa Barbara, has developed a chip-scale silicon nitride optical cavity. …
Neutral-atom quantum hardware and sensing developer Infleqtion (NYSE: INFQ), in collaboration with Honeywell Aerospace and UC Santa Barbara (UCSB), has unveiled a chip-scale integrated optical cavity prototype engineered to miniaturize lasers and optical stabilization systems across quantum sensors, optical atomic clocks, and neutral-atom quantum processing units (QPUs).
Designed by Infleqtion’s engineering team alongside Professor Daniel J. Blumenthal’s Optical Communications and Photonic Integration (OCAQπ) Group at UCSB, the optical cavity was fabricated using Honeywell Aerospace’s silicon nitride (Si3N4) photonic integration foundry process. In neutral-atom and optical quantum architectures, optical cavities stabilize narrow-linewidth lasers required for atomic cooling, trapping, and high-fidelity gate operations. Transitioning these historically large, tabletop bulk-glass optical cavities to chip-scale silicon nitride wafers enables volume manufacturing in standard commercial semiconductor foundries.
[ Infleqtion, Honeywell & UCSB Photonic Cavity Prototype Specifications ] | ||
Technical Feature | Manufacturing Process & Materials | Engineering Impact & Target Systems |
• Photonic Integration Platform | • Ultra-low loss Silicon Nitride (Si3N4) • Commercial semiconductor foundry process | • Replaces bulk-glass tabletop optical cavities with chip-scale photonic integrated circuits |
• Foundry Manufacturing | • Honeywell Aerospace Photonics Foundry • Scalable commercial wafer-level manufacturing | • Enables mass production of integrated laser stabilization components for field-deployable systems |
• Intellectual Property Base | • Co-designed with UCSB OCAQπ Group • Incorporates SiNoptiq IP acquired by Infleqtion | • Facilitated by UCSB Office of Technology & Industry Alliances (TIA) patent portfolio |
• Deployment Targets | • Handheld quantum sensors & RF receivers • Quantum optical clocks & neutral-atom QPUs | • GPS-denied precision navigation, timing for telecommunication cell towers, and data centers |
The prototype builds on photonic intellectual property developed by SiNoptiq, a UCSB spin-off founded by Blumenthal that Infleqtion acquired in 2024. By embedding narrow-linewidth laser stabilization directly onto silicon nitride chips, the collaboration establishes a manufacturing pathway for field-deployable quantum systems, including atomic timing devices, quantum-enhanced inertial navigation, and compact neutral-atom quantum computers.
Review the full release here.
October 6, 2026
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