In the global race for quantum computing, debates often focus on qubits and algorithms. Yet one of the most critical obstacles on an industrial scale lies in a much less visible area: cabling. Behind each superconducting qubit, a control line transports signals and heat to the heart of the cryostats, these extreme refrigerators where matter approaches absolute zero. The more qubits multiply, the more this architecture becomes unmanageable.
Today, exceeding a thousand qubits is almost impossible, each added line increases the thermal load, the size and the cost. Building a computer with a million qubits would require giant installations and billions of euros of investment, a structural impasse, which the young Parisian startup Isentroniq intends to resolve by tackling the most neglected link in quantum, which is superconducting cabling.
The startup designs a new generation cabling architecture, based on superconducting materials and a compact design, capable of reducing thermal load while guaranteeing signal purity. Ultimately, this approach could reduce the cost of a system with one million qubits to around fifty million euros, a reduction of a factor of one hundred compared to current solutions.
Isentroniq adopts a fabless strategy with in-house design and production entrusted to specialized industrial partners. This model makes it possible to limit material investments while accelerating the transition from laboratory to series production.
“Infrastructure is the real bottleneck for quantum. Our mission is to transform it into an accelerator,” explains Paul Magnard, co-founder and CEO of Isentroniq. “Thanks to this fundraising, we will industrialize a wiring technology capable of supporting machines with more than a million qubits and making quantum practical, serving research, industry and society. »
The company was co-founded by Paul Magnard, a doctor in superconducting circuits trained at ETH Zurich and former chief architect at Alice & Bob, and by Théodore Amar, an engineer from Centrale Paris and a graduate of ESSEC, who worked for Bain & Company and Hilti. The first embodies the scientific dimension of the project, the second its industrial and strategic anchoring.
Isentroniq announces a fundraising of 7.5 million euros from Heartcore, iXcore, Kima, Better Angle, Epsilon VC, Ovni, as well as Bpifrance and the ANR as part of the France 2030 program. This financing will accelerate the development of superconducting cabling technology, strengthen the engineering teams and establish industrial partnerships. Based in Paris, the startup plans to open new positions in 2026, notably for Quantum Engineer, Mechanical Engineer, Radiofrequency Engineer and Software Engineer profiles.
