Founded in 2020 and based in the heart of Paris, C12’s mission is to be at the center of one of the biggest technological breakthroughs of the century and change the course of history by building a universal quantum computer.
At C12, we believe that achieving a true breakthrough in quantum computing requires rethinking the fundamentals. That’s why our founders—deeply rooted in academic and engineering excellence—have chosen carbon nanotubes as the building blocks of our quantum processors. This ultra-pure material dramatically reduces error rates, boosts performance, and minimizes hardware overhead—key ingredients for scalable, fault-tolerant quantum computing. By crafting a unique approach that scales, we aim to revolutionize quantum computing just as silicon transformed classical computing.
Since our founding, we’ve raised over €25 million in funding, published 11 scientific papers, and secured 8 patents. Today, our fast-growing team of 75, including 20 PhDs, has over 25 nationalities represented. We have our own cutting-edge lab spaces in Paris' historic Panthéon district, where scientists, engineers, and innovators work side-by-side to tackle some of the most exciting technical challenges of our time.
If you're passionate about shaping the future of quantum technology and want to make a real impact, C12 offers a unique environment to grow, learn, and innovate.
As a Senior Quantum Error Correction (QEC) Scientist, you will play a central role in shaping C12’s fault-tolerant quantum computing strategy.
You will design, analyze, and optimize fault-tolerant architectures tailored to our carbon nanotube-based spin qubit platform, working at the intersection of theory, simulation, and hardware constraints.
You will contribute directly to the development of scalable, fault-tolerant quantum processors by practical implementation of abstract QEC protocols. This includes defining building blocks of the fault-tolerant architecture, evaluating thresholds, connectivity requirements and guiding experimental implementations in close collaboration with hardware and control teams.
Your work will be crutial in determining the path toward achieving logical qubit performance exceeding that of physical qubits, a key milestone for practical quantum advantage.
C12 is a Paris-based quantum computing startup building the next generation of scalable quantum computers.
Unlike Big Tech players, we’re pioneering a unique approach rooted in breakthrough materials science and novel interconnects. It's widely seen as the only path to true large-scale quantum computing.
We’re early-stage, fast-moving, and already a leader in Europe for spin qubits. Backed by over €25M in equity funding, our international team of 55 includes 25 world-class quantum scientists. Together, we’ve built a first-of-its-kind quantum chip production line and delivered devices with record-setting performance.
C12 is already generating revenue by partnering with leading industrial companies, helping them begin their quantum computing journey and tackle their most complex computational challenges.
