Most quantum computing startups begin by asking the world for a favour. Build us new materials, they say, new fabrication lines, supply chains that do not yet exist, and trust that the physics will pay it all back later. Quobly, a Grenoble company that raised €115 million last week, is making the opposite request, which is almost no request at all. It wants to build quantum computers inside the silicon fabs Europe already has.

The Series A was co-led by the French public bank Bpifrance, the European chip-security company SEALSQ, and STMicroelectronics, one of the largest semiconductor manufacturers on the continent. The European Innovation Council Fund joined, along with the investment club Blast, Air Liquide’s venture arm ALIAD, and existing investor Innovacom; the research institutes CEA and CNRS, plus Quantonation and Supernova Invest, stayed on the cap table. Read as a list, it is less a venture syndicate than a roll call of the French industrial state, and that is the point.

The substrate is the strategy

Quobly’s wager sits in a single material choice. A quantum computer needs qubits, the fragile quantum cousins of the bits in an ordinary processor, and the field has spent two decades arguing about what to make them from: superconducting circuits, trapped ions, photons, neutral atoms, each with its own laboratory and its own believers. Quobly encodes its qubits in silicon, using FD-SOI technology on 300mm wafers, the format that already runs through commercial chip lines. The claim is that manufacturability beats raw qubit counts over a long enough horizon, because a quantum chip that can ride the cost curve and yield discipline of the existing semiconductor industry will scale where a hand-built marvel will not.

That is why STMicroelectronics matters more as a partner than as a cheque. Quobly built its first chips on a pilot line with the French research institute CEA-Leti; the new money is meant to carry the process onto ST’s industrial 300mm environment, the step from a demonstration to something a fab can repeat. Maud Vinet, Quobly’s co-founder and CEO, ran silicon-qubit research at CEA-Leti before starting the company in 2022, which means the institute now on the cap table is also the one she came out of. She frames the round as the move “from technology validation to industrial execution,” the honest description of where the company is, and of how far it still has to go.

The numbers underneath are modest against the headline. Quobly raised roughly €19 million across its 2023 to 2025 seed phase and booked about €10 million in revenue over 2025 and 2026, most of it from Proqcima, the French government programme aiming for a large-scale quantum machine by 2032. In plain terms, a largely pre-revenue company has been handed €115 million on the strength of a manufacturing thesis. The investors are buying a roadmap.

Quantum gets filed under sovereignty

The more revealing thing about the round is who wrote the cheques and what they said about it. Gwenaël Hamon of Bpifrance described the investment as backing “the emergence of sovereign technology champions” and tied it explicitly to “Europe’s strategic autonomy in quantum computing.” It is the same logic now driving the continent’s spending on chips, on AI compute, on defence: keep the capability, and the manufacturing that underpins it, on European soil. Quobly’s silicon bet appeals to this kind of money precisely because it runs through European fabs and European research institutes rather than around them.

There is a recent memory shaping the instinct. Europe watched the first wave of AI compute land almost entirely in American hands, and the policy class has decided not to repeat the experience with the next platform. Quantum, still years from a fault-tolerant machine that does anything commercially decisive, has been pulled forward into that argument anyway. The same impulse that put a record £260 million into the UK’s Oxford Quantum Circuits this month, and earlier sent capital toward European chip-tooling names like Nearfield Instruments, is now underwriting a French silicon-qubit company before it has sold a single computer.

The bet is real, the result is not in hand

None of this settles the physics. Silicon, or spin-qubit, computing is one approach among several, and none has yet shown a decisive, fault-tolerant advantage at scale. Quobly is not even alone inside its own lane: the Oxford spinout Quantum Motion is chasing silicon qubits too, working with the US chipmaker GlobalFoundries, a reminder that “use the existing semiconductor industry” is a strategy other people can also run. A 100-qubit chip is a milestone, not a working machine, and the plan to put Alloy Pioneer on the cloud by the end of 2026 and into HPC data centres in 2027 is a schedule, not a track record.

There is a quieter risk folded into the cap table itself. When your lead investors are also your fab, your gas supplier, and the government programme buying your early output, the line between backer, customer, and patron blurs. Strategic money of this kind can tie a company tightly to one manufacturing partner and one national agenda, which is a strength while the agenda holds and a constraint the day it shifts. Quobly is betting that the agenda, European technological sovereignty, is durable enough to build a decade on.

What €115 million buys is time and a fab. The company now has the capital to find out whether its manufacturing-first instinct is right, and a chipmaker sitting in the cap table to build the answer with. Quobly is headquartered in Grenoble with offices in Singapore and Canada and roughly 100 people behind the roadmap. Europe has decided it wants to own the substrate of the next computing era. Whether silicon is that substrate is the one question the money cannot answer, and the qubits, when the first machine reaches the cloud, will have to answer it themselves.