Deep Dive Series
What It Takes to Build a Quantum Computer
The headlines go to the companies designing quantum processors. But behind every qubit sits a hidden supply chain: dilution refrigerators cooled to fifteen millikelvins, ultra-stable laser systems, precision RF and microwave electronics, single-photon detectors, vacuum chambers, cryogenic cabling, and fabrication facilities operating at tolerances that would make a semiconductor fab engineer wince. No quantum computer is built by one company alone — and the enabling technologies, specialist suppliers, and infrastructure dependencies are often more strategically important than the processor itself.
This Deep Dive series maps that hidden layer, modality by modality. For superconducting, trapped-ion, photonic, neutral-atom, and silicon spin approaches, I trace the full stack of enabling technologies and the companies behind them — from cryogenics and control systems to materials and fabrication. The capstone article provides the strategic overview and cross-cutting themes; the individual articles go deeper on each modality’s ecosystem. Read them in sequence or start with whichever supply chain matters most to you.
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A map of the hidden supply chains behind every major quantum computing modality — and a guide to where value, risk, and strategic leverage actually sit. The headlines go to the companies designing quantum processors, but behind every qubit sits an ecosystem of enabling technologies without which the processor is just a blueprint: dilution refrigerators, precision laser systems, photonic foundries, ultra-high vacuum chambers, isotopically purified silicon, cryogenic cabling, and classical control electronics built by a small number of specialist suppliers. These supply chains are not interchangeable — each modality draws from a different industrial base, faces different bottlenecks, and carries different geopolitical vulnerabilities. This article is the capstone of the "What It Takes to Build a Quantum Computer" Deep Dive series. It introduces the strategic themes that cut across all five modality-specific ecosystem analyses — concentration risk, vertical integration, sovereignty implications, and shared dependencies — then links to the dedicated deep dives on superconducting, trapped-ion, photonic, neutral-atom, and silicon spin supply chains, plus the cross-cutting infrastructure technologies that will determine which quantum computers actually scale.
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Quantum Ecosystem
The Foundry’s Hidden Supply Chain: Who Really Wins If Silicon Spin Quantum Computing Wins
In September 2025, a team from the Australian startup Diraq and Belgium's imec published a result in Nature that no one in the semiconductor industry could ignore. They had fabricated silicon quantum dot spin qubits on imec's industrial 300-millimeter wafer line - the same kind of manufacturing platform that produces billions of classical processors every year - and achieved two-qubit gate fidelities consistently exceeding 99%.…
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Quantum Ecosystem
The Infrastructure Beneath the Qubit: Four Enabling Technologies That Will Determine Which Quantum Computers Actually Scale
Quantum computing captivates with its physics: superposition, entanglement, interference. The companies that build qubits get the headlines, the funding rounds, and the breathless media coverage. But the companies that build the infrastructure beneath the qubits - the electronics that control them, the refrigerators that cool them, the decoders that correct their errors, the materials that make all of it possible - hold a disproportionate influence…
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Quantum Ecosystem
The Tweezer Array’s Hidden Supply Chain: Who Really Wins If Neutral-Atom Quantum Computing Wins
In 2025, a team at Harvard, MIT, and QuEra did something that no quantum computing platform had done before: they ran a 3,000-qubit atom array continuously for over two hours, replenishing lost atoms mid-computation - effectively building the first quantum computer that could operate without stopping to reload. In a separate result published in Nature, the same constellation of researchers demonstrated below-threshold quantum error correction…
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Quantum Ecosystem
The Fab’s Hidden Supply Chain: Who Really Wins If Photonic Quantum Computing Wins
In February 2025, a team of more than ninety researchers published a paper in Nature describing something the photonic quantum computing community had been waiting a decade to see: a complete quantum photonic technology stack - single-photon sources, superconducting detectors, ultra-fast optical switches, and low-loss waveguides - fabricated on full-size silicon wafers at a commercial semiconductor foundry. The foundry was GlobalFoundries' Fab 8 in Malta,…
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Quantum Ecosystem
The Optical Table’s Hidden Supply Chain: Who Really Wins If Trapped-Ion Quantum Computing Wins
In September 2025, IonQ paid $1.075 billion for a company called Oxford Ionics that had built precisely one quantum computer. It wasn't the qubit count that justified the price tag. Oxford Ionics held fewer than two dozen qubits at the time. What IonQ bought was a method for getting rid of lasers. That may sound counterintuitive. Trapped-ion quantum computing is, at its core, a laser-and-atom…
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Quantum Ecosystem
The Chandelier’s Hidden Supply Chain: Who Really Wins If Superconducting Quantum Computing Wins
In September 2025, Bluefors - the Finnish company whose cryogenic systems cool most of the world's superconducting quantum computers - signed a deal to buy up to ten thousand liters of helium-3 per year. The supplier? Interlune, a Seattle startup planning to mine the isotope from the surface of the Moon. The deal, running from 2028 to 2037, is worth contemplating not for its science-fiction…
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