The thesis
The quantum race will be won by whoever owns the chokepoints.
Dilution refrigerators, helium-3, silicon-28, control electronics, lasers, ultra-high vacuum. Quantum Bottlenecks maps the physical supply chain behind every qubit — and the listed companies that own each choke. Own the strait, not the tanker.
The market stares at the obvious names. The binding constraints sit further upstream, where a handful of companies own each physical chokepoint — and most of them are not household names. That is exactly the point.
We walk the supply chain layer by layer. For each link we ask the same three questions: who physically owns the choke, what it would take for someone else to credibly compete, and what the next catalyst is that forces the market to reprice.
The answers land on a living map of 51 listed companies across 10 chokepoints — each with a conviction tier, a bull and bear case, a catalyst path, and the source trail behind every mapping. It is a research map, not a portfolio. Own the strait, not the tanker.
The chokepoints
- ICryogenics & dilution refrigerators
Superconducting qubits live below 20 millikelvin — and almost every fridge that gets there comes from two companies.
- IIHelium-3 & cryogen supply
He-3 comes almost entirely from tritium decay in weapons programs; without it dilution refrigeration does not exist.
- IIIIsotopes & quantum materials
Isotopically pure silicon-28, high-purity niobium, and superconducting wire are single-digit-supplier markets.
- IVControl electronics & cryo-CMOS
Every qubit needs room-temperature control channels that cost more than the qubit; scaling dies here first.
- VLasers & precision photonics
Trapped-ion and neutral-atom machines are built out of narrow-linewidth lasers, AOMs and optics from a handful of suppliers.
- VIUltra-high vacuum systems
Ion traps and atom arrays need 10^-11 torr; the pump and chamber supply chain is an oligopoly nobody prices.
- VIIQubit fabrication & foundry
Superconducting and photonic qubits pass through a tiny set of trusted foundries with quantum process lines.
- VIIIClassical co-processing & error correction
Real-time quantum error correction needs classical compute physically beside the QPU; decoding is a silicon problem.
- IXPlatform pure-plays
The visible layer: listed quantum computer makers racing fault tolerance, burning cash, and repricing on every milestone.
- XPrivate giants & exposure vehicles
Quantinuum, PsiQuantum, QuEra, SandboxAQ — the heavyweight cap tables without tickers, and the listed paths into them.