The Coldest Place on Earth — Dilution Refrigerators
To run a superconducting qubit you must cool the chip colder than deep space. Two companies on Earth make the machines that do that.
A superconducting qubit only works if you cool the chip to about 10-15 millikelvin — that is one-hundredth of one degree above absolute zero, several thousand times colder than the cosmic microwave background. The only commercial way to achieve this is a dilution refrigerator — a multi-stage cryostat that uses a mixture of two helium isotopes (helium-3 and helium-4) circulating through chambers at progressively colder stages. Per ICVTank/Business Research Insights, Bluefors (private, Finland) holds ~34% market share and Oxford Instruments (public, UK) holds ~21-25%; together over 70%. A dilution refrigerator system costs $500K-$3M and takes 12-18 months to deliver. Every superconducting qubit (IBM, Google, Rigetti, IQM, D-Wave annealing), spin qubit (silicon quantum), and topological qubit (Microsoft) approach needs one. Only trapped-ion (IonQ, Quantinuum) and photonic (PsiQuantum, Xanadu) approaches avoid the millikelvin requirement.
You cannot run a superconducting qubit lab without one. There are essentially two suppliers. Behind them sits an even deeper chokepoint: helium-3 . White House OSTP Assistant Director Steve Fetter publicly stated that "about 8,000 liters of helium-3 each year will accumulate from the decay of tritium" — roughly 1 kg/year from natural decay alone — against demand of "at least 40,000 liters per year" per an AAAS workshop report. Annual global production is in the low-tens-of-kilograms range. This is a genuinely strategic, long-term constraint that no one has priced.
3 names on the watchlist
The only publicly traded dilution-refrigerator pure-play. With private Bluefors, more than 70% combined market share.
UK-listed scientific instruments group. The NanoScience division makes ProteoxLX and Proteox5mK dilution refrigerators — the only commercial systems that reach below 5 millikelvin continuously. Per Business Research Insights, Oxford Instruments NanoScience holds ~14-25% of global dilution-fridge share (varying by methodology). The only public pure-ish play in the category. Recent customer collaborations include IBM Goldeneye (the giant fridge IBM is building for Starling) and Fermilab Colossus.
Finnish leader at ~34% dilution-fridge share. Over 1,500 systems installed globally. Private — no public ticker.
The market leader in dilution refrigerators is private . Over 1,500 systems installed; recently expanded Syracuse, NY production. Owns Cryomech (acquired 2023) for cryogen-free expansion. No public ticker. Closest investable proxy is Oxford Instruments (above), which competes head-to-head with Bluefors for every major quantum-computing customer.
Owns CryoConcept (mid-tier dilution-fridge maker). Manages industrial gases including strategic helium reserves.
French industrial gas major. Owns CryoConcept , a mid-tier dilution refrigerator maker, and manages strategic helium reserves — the cryogen that feeds everything in quantum. Lower-purity exposure to the quantum picks-and-shovels thesis through a diversified industrial gas business. Lower beta, lower upside, but a real (if buried) call option on helium-3 economics over the next decade.
- Business Research Insights, AAAS · May 2026