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COMPANY RESEARCH / 6971.T

Kyocera

Sapphire substrates with superconducting vias (R&D)

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Where it fits in a quantum computer

Six researchers from Kyocera’s Corporate R&D, Industrial Tool and Fine Ceramics groups published ‘Superconducting Through-Substrate Vias on Sapphire Substrates for Quantum Circuits’ in IEEE Transactions on Quantum Engineering (vol. 5, 2024), work on sapphire substrates for superconducting quantum circuits.

What the evidence establishes

Upstream enabler

Disclosed: a 2024 IEEE Transactions on Quantum Engineering paper by Kyocera researchers covers superconducting through-substrate vias on sapphire for quantum circuits.

Materials, isotopes, gases, substrates, equipment or foundry capacity behind quantum-computer components. This is not a component supplier role or an established quantum revenue stream.

Component roleSapphire substrates with superconducting vias (R&D)
EvidenceDisclosed: a 2024 IEEE Transactions on Quantum Engineering paper by Kyocera researchers covers superconducting through-substrate vias on sapphire for quantum circuits.
How we knowDisclosed The company’s own filing, release, annual report, product page or investor record describes the quantum-computing role. Where customers are unnamed, the listing says so.
Primary sourceKyocera — 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

This is published research, not a product launch or supply agreement, and no quantum customer is named; the paper’s full text was not read (title, journal and Kyocera affiliations come from its DOI record). Sapphire is an alternative to the illustrated high-resistivity silicon.

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.

Related research

Companies with overlapping sector exposure. Their products and evidence may differ; this is not a list of equivalent investments.

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