Quobly announced a major step in building its industrial value chain, with the first custom 28Si FD-SOI wafers from Soitec now running in STMicroelectronics’ 300 mm manufacturing facilities in Crolles, France. The achievement—part of the companies’ strategic collaboration—establishes a fully integrated pathway from advanced materials to quantum integrated circuits and marks a global first for FD-SOI with a 28Si-enriched channel. It advances Quobly’s roadmap toward million-qubit technology and accelerates the industrialization of quantum processor units (QPUs).

“The industrial availability of purified isotope 28 FD-SOI wafers is a game changer for quantum technologies. It allows us to anchor our developments in a solid and proven supply chain from purified gas to quantum chip delivery—a key enabler for achieving our quantum performance targets,” said Nicolas Daval, Chief Engineering Officer of Quobly.

“We are proud to see Soitec’s advanced substrates contributing to the emergence of Europe’s quantum ecosystem. This milestone illustrates how our expertise in engineering semiconductor materials can enable the next generation of quantum technologies,” said Christophe Maleville, Chief Technology Officer, Senior Executive VP Innovation of Soitec.

Manufactured on Soitec’s industrial lines, the new 28Si FD-SOI substrates are engineered to eliminate isotopic impurities, significantly reducing quantum noise and enabling single-qubit gate fidelities approaching 99.999%—a foundation for reliable, scalable silicon-based quantum processors.

By combining the FD-SOI platform—a low-noise, CMOS-compatible architecture—with a 28Si-enriched channel, Quobly creates a scalable path to silicon-based quantum processors that benefits from mature, robust industrial semiconductor processes. The approach underpins the transition from millions of physical qubits to thousands of logical qubits, with the potential to unlock advances in materials discovery, energy optimization and biotechnological modeling.

The collaboration aligns the strengths of each partner: Soitec for industrial manufacturing of advanced substrates, STMicroelectronics for technology validation and processing in a high-volume 300 mm fab, and Quobly for quantum device development. With the first wafer lots in production at Crolles and ongoing process development leveraging STMicroelectronics’ 28 nm FD-SOI process, initial performance data from prototype devices are expected in the first quarter of 2026.

Original – Soitec