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Soitec

28Si FD-SOI substrates for Quobly’s spin-qubit chips

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Where it fits in a quantum computer

Supplied the first custom FD-SOI wafers with an isotopically enriched silicon-28 channel for Quobly, made on Soitec’s industrial lines and cycling in STMicroelectronics’ 300 mm fab in Crolles as of Dec 9, 2025, which Quobly calls a global first; the substrates are engineered to cut isotopic impurities for single-qubit gate fidelities approaching 99.999%. Quobly names Soitec, with Air Liquide and Orano, as a strategic partner in its silicon-28 value chain (Sept 16, 2026).

What the evidence establishes

Quantum-computing evidence

Partner-disclosed: Quobly’s Dec 2025 release, with a quote from Soitec’s CTO, says Soitec provided the first custom 28Si FD-SOI wafers now cycling in ST’s 300 mm fab.

An explicit quantum-computing product, design-in, supply role, program or partnership, such as a part sold for quantum computers or a named quantum-computer customer. For a maker, it means the company’s own quantum computers or processors. This does not establish revenue, market share, volumes or future sourcing.

Component role28Si FD-SOI substrates for Quobly’s spin-qubit chips
EvidencePartner-disclosed: Quobly’s Dec 2025 release, with a quote from Soitec’s CTO, says Soitec provided the first custom 28Si FD-SOI wafers now cycling in ST’s 300 mm fab.
How we knowPartner-disclosed A named partner, customer or platform owner’s document names the company. The scope is that document’s system or program, not a general supply relationship.
Primary sourceSoitec — supporting disclosure
Company or official disclosure; vendor claims are attributed to their source.
Checked. This is the research review date, not the source publication or quote time.

Keep in perspective

The wafers feed prototype silicon spin-qubit devices, not the illustrated superconducting chip, and the fidelity figure is a design target. No volumes, prices or revenue are disclosed.

Diversified business exposure. This describes the breadth or role of the business; it is not an investment rating. A quantum-computing product, design-in or partnership does not by itself establish material quantum revenue, market share, or future returns.

Connections to the assembly

These links explain the technology relationship. The model is illustrative and does not represent an actual manufacturer’s bill of materials.

Substrate wafers

High-resistivity silicon or sapphire wafers, chosen because they absorb very little microwave energy. Isotopically purified silicon is the substrate of choice for spin qubits.

Scope of the company links: Superconducting qubits are built on high-resistivity silicon or sapphire, and silicon spin qubits need isotopically purified silicon-28. Soitec supplied the first custom 28Si FD-SOI wafers for Quobly, cycling in STMicroelectronics’ 300 mm fab since December 2025, and Silex finished building a laser plant for enriched silicon-28 in June 2026 (commissioning due late 2026) with Silicon Quantum Computing as initial offtake partner. For superconducting chips, QuTech’s 2026 flip-chip qubits started from >20 kΩ·cm wafers ‘sourced from Topsil’, a GlobalWafers company, and Kyocera researchers published superconducting vias through sapphire substrates for quantum circuits (2024); both are thinner, research-level links. Quobly also names Air Liquide and the unlisted Orano as silicon-28 partners without detailing their roles, so Air Liquide is not mapped here. The largest wafer makers (Shin-Etsu, SUMCO, Siltronic) document no qubit role and are not mapped.

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