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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.
51 names tracked · 10 chokepoints · free, no login
The chokepoints
I
Cryogenics & dilution refrigerators
Superconducting qubits live below 20 millikelvin — and almost every fridge that gets there comes from two companies.
BLUEFORS · QDI · FORM · SOHVY · AIQUY · MAYBELL
II
Helium-3 & cryogen supply
He-3 comes almost entirely from tritium decay in weapons programs; without it dilution refrigeration does not exist.
ASPI · LIN · APD · AIQUY · FORM · BLUEFORS · INTERLUNE
III
Isotopes & quantum materials
Isotopically pure silicon-28, high-purity niobium, and superconducting wire are single-digit-supplier markets.
ASPI · SILXY · BRKR · ATI · AMSC · CBMM
IV
Control electronics & cryo-CMOS
Every qubit needs room-temperature control channels that cost more than the qubit; scaling dies here first.
KEYS · FORM · INTC · NVDA · QMACHINES · QBLOX · ZHINST
V
Lasers & precision photonics
Trapped-ion and neutral-atom machines are built out of narrow-linewidth lasers, AOMs and optics from a handful of suppliers.
GCHHF · TOPTICA · COHR · IPGP · MKSI · HPHTY · MSQUARED
VI
Ultra-high vacuum systems
Ion traps and atom arrays need 10^-11 torr; the pump and chamber supply chain is an oligopoly nobody prices.
ATLKY · A · MKSI · VACNY · PFFVF · INFQ · KJLC
VII
Qubit fabrication & foundry
Superconducting and photonic qubits pass through a tiny set of trusted foundries with quantum process lines.
GFS · SKYT · PSIQUANTUM · IONQ · AMAT · RGTI · QUBT
VIII
Classical co-processing & error correction
Real-time quantum error correction needs classical compute physically beside the QPU; decoding is a silicon problem.
NVDA · AMD · IBM · KEYS · RIVERLANE · QMACHINES
IX
Platform pure-plays
The visible layer: listed quantum computer makers racing fault tolerance, burning cash, and repricing on every milestone.
IONQ · QNT · RGTI · QBTS · QUBT · ARQQ · PSIQUANTUM
X
Private giants & exposure vehicles
Quantinuum, PsiQuantum, QuEra, SandboxAQ — the heavyweight cap tables without tickers, and the listed paths into them.
QNT · HON · NVDA · GOOGL · PSIQUANTUM · SANDBOXAQ · QUERA
Latest brief · 2026-10-27
The quantum enabling layer outran the pure-plays, with photonics name Coherent leading on datacenter-optics demand while the qubit platforms drifted lower.
The leader was Coherent (COHR), up 5.8% to $221.50 on the lasers-photonics chokepoint — the optics, laser and transceiver supply that underpins both AI datacenter interconnect and the photonic layer of several quantum architectures. The move rode a broad optics rally driven by AI-datacenter demand for high-speed transceivers; Coherent's most recent quarter showed datacenter-and-communications revenue growing more than 40% year over year, and the name trades as a picks-and-shovels proxy rather than a quantum pure-play. Its strength is a read on the photonics strait being supply-constrained and well-bid, not on any quantum-specific print.
The laggard was Quantum Computing Inc. (QUBT), down 2.3% to $6.41 on the platforms rung. There was no company news; the session simply saw the speculative qubit-platform cohort give ground while capital favored the enabling supply chain. The other pure-plays drifted with it — IonQ (IONQ) −1.6% to $30.76, D-Wave (QBTS) −1.0% to $11.54 and Rigetti (RGTI) −0.7% to $11.44 — a rotation within the vertical rather than a thesis-level move on any single platform.
That rotation defined the tape: the materials, fabrication and instrumentation rungs led. On isotopes-materials, ATI (ATI) rose 4.9% to $164.54 and Silex Systems' ADR (SILXY) added 4.3% to $11.99; Intel (INTC) gained 4.0% to $90.47 on the classical-coprocessing rung; and the control-electronics and vacuum/photonics subsystems firmed — Keysight (KEYS) +3.6% to $326.04, MKS Instruments (MKSI) +2.9% to $202.28 and Applied Materials (AMAT) +2.7% to $387.59 on the qubit-fabrication rung. The structural read is consistent with the vertical's thesis: the measurable value sits in the toolmakers and materials that every architecture must buy, and they moved as a group while the qubit platforms did not.
The forward calendar centers on the DARPA Quantum Benchmarking Initiative: Stage B concludes and the Stage C downselect window opens November 6, with the Stage-C selection decisions expected by late November — a hard, government-graded read on which platforms clear the credibility bar. Beyond that, Q2B26 Chicago runs December 8–10 alongside the Chicago Quantum Summit. Until the DARPA downselect lands, the pure-plays are trading on positioning while the enabling rungs trade on demand that is already here.