Quobly Initiates Processing of 28Si FD-SOI Wafers at STMicroelectronics’ 300 mm Fab
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Quobly Initiates Processing of 28Si FD-SOI Wafers at STMicroelectronics’ 300 mm Fab Quobly, a pioneer in silicon-based quantum microelectronics, has announced a major milestone in establishing its industrial supply chain: the first custom 28Si FD-SOI wafers, manufactured by Soitec, are now cycling inside STMicroelectronics’ 300 mm manufacturing facility in Crolles, France. This collaboration establishes a fully integrated European value chain from advanced materials to quantum integrated circuits. The FD-SOI (Fully Depleted Silicon-on-Insulator) substrates have been engineered to eliminate isotopic impurities, drastically reducing quantum noise. This technical step is critical for unlocking single-qubit gate fidelities that approach 99.999%—a key threshold for building reliable and scalable silicon-based quantum processors. The project leverages the strengths of all three partners: Soitec for the industrial manufacturing of the advanced 28Si substrates, STMicroelectronics for technology and process validation in a high-volume 300 mm fab, and Quobly for the development of the quantum devices. The integration of the FD-SOI platform—a proven, low-noise, CMOS-compatible architecture—with the purified silicon channel offers a scalable path towards million-qubit technology. This milestone is a global first in the field of FD-SOI utilizing a 28Si-enriched channel. Quobly expects to receive the earliest performance metrics of these prototype devices in the first quarter of 2026, building upon STMicroelectronics’ 28 nm FD-SOI process. Read the full announcement here. December 9, 2025 Mohamed Abdel-Kareem2025-12-09T15:55:13-08:00 Leave A Comment Cancel replyComment Type in the text displayed above Δ This site uses Akismet to reduce spam. Learn how your comment data is processed.