Aalto Spinout Coherence Quantum Secures €2.78M Seed to Cut the Wiring and Heat Holding Back Bigger Quantum Computers

"As quantum computers become more powerful, the infrastructure around them has to scale too," Sah said. "Our aim is to give quantum‑computer builders an architecture that can support larger systems without wiring, cooling requirements, and complexity growing at the same rate."

Coherence Quantum is developing an integrated cryogenic signalling and control platform. It starts with cryogenic signal‑conditioning technologies, namely thermalised filters and attenuators designed to reduce the heat generated when qubits are manipulated and to shield them from noise that existing components let through. From there, the company is working towards higher‑density interfaces and more of the control electronics integrated inside the refrigerator.

The goal is fewer cables running into the machine, with smaller components controlling qubits from inside the cold stage. Coherence Quantum has four patent applications covering components that sit close to the qubit.

Its target customers are the groups building quantum processors. The company focuses on the two chip‑based qubit types, superconducting and spin qubits, both of which only function at temperatures near absolute zero.

Kundu is an experimental quantum physicist who played a key role in building and setting up Aalto University's 20‑qubit Q20 quantum computer. Soininen previously held a product leadership role at Bluefors, a maker of cryogenic systems used for quantum computers. The team's combined experience covers quantum physics, cryogenics, radio‑frequency and microwave engineering, electronics and product development.

Founders have also said the company needs significant hardware development before it can bring this part of the quantum computer to market, which is where the seed money is aimed.

Petteri Koponen of Lifeline Ventures said Coherence Quantum is going after a fundamental part of the scaling challenge. Mickos said the company addresses a pressing need in quantum computing: supporting large numbers of qubits while managing growing heat, noise and complexity.

The seed round will pay for a laboratory in Espoo, early product prototypes, work on manufacturing processes and growth of the team. The company has not announced customers or pricing.

Interest in the enabling hardware around quantum processors has grown alongside work on the processors themselves. A US federal quantum plan published in May named cryogenic integration and control hardware among its priorities. No quantum computer has yet solved useful problems at scale, and companies in the field are working on error correction, qubit quality and the supporting infrastructure in parallel.

Coherence Quantum's work belongs to that supporting layer. Its parts sit between the quantum chip and the electronics outside the refrigerator, an area where signal quality, heat load and cable count all affect how large a system can become.

Finland has an established quantum research base through Aalto University and its partners, and Coherence Quantum is the latest company to emerge from that environment.