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COMPANY RESEARCH / 5711.T

Mitsubishi Materials

High-purity copper used in cryogenic refrigerator parts

Published by FyncaResearch checked How we research

Where it fits in a quantum computer

Makes MOF-6N8 high-purity copper (99.99998% Cu) whose residual resistivity ratio exceeds 3,000; the company says it has been adopted for special applications such as components for cryogenic refrigerators and space-technology R&D.

What the evidence establishes

Upstream enabler

Disclosed: Mitsubishi Materials’ high-purity copper page cites components for cryogenic refrigerators among its applications.

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 roleHigh-purity copper used in cryogenic refrigerator parts
EvidenceDisclosed: Mitsubishi Materials’ high-purity copper page cites components for cryogenic refrigerators among its applications.
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 sourceMitsubishi Materials — 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 page names no dilution-refrigerator maker, quantum computer or customer, so its use in quantum cryostats is an inference; semiconductor sputtering targets and bonding wire are the main uses it cites.

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.

Temperature stages

Gold-plated copper plates at about 50 kelvin, 4 kelvin, 0.8 kelvin (the still), 0.1 kelvin (the cold plate) and 10 millikelvin (the mixing chamber), held apart by thin supports that conduct little heat.

Scope of the company links: The copper stages come with each dilution refrigerator, so the listed refrigerator makers (ULVAC, QuantumCTek, FormFactor, Nippon Sanso) are mapped; stage sizes are published only for some systems, such as the 590 mm sample space of QuantumCTek’s F1100 and the 530 mm plate of private Quantum Design Oxford’s ProteoxLX. Mitsubishi Materials is mapped upstream because it says its high-purity copper (residual resistivity ratio above 3,000) is used in cryogenic-refrigerator components. No source names the copper or gold-plating supplier of any quantum cryostat, and Aurubis (Cu-OFE copper with no cryogenic use cited) is 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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