The future quantum standard

C12 is founded by twin brothers Matthieu and Pierre Desjardins, spinning out of the ENS Physics Lab in Paris with scientific advisors Takis Kontos and Matthieu Delbecq. From day one, our focus is clear: carbon, purity, and the pursuit of fault-tolerant quantum computing.

We raise USD 10 million in seed funding, backed by pioneers in tech and science. The team grows to ten across three sites, building early experiments and early trust.

We file a first wave of foundational patents, securing key innovations in qubit control, carbon nanotube growth, and quantum device architecture. These filings anchor our long-term roadmap and mark the beginning of our IP journey.

We release Callisto, our quantum emulator grounded in carbon nanotube physics. It gives developers a powerful and realistic tool to design and refine quantum algorithms.

We open our 800m² fabrication hub in the heart of Paris: cleanroom, cryostats, and full-stack control.

We close an €18 million pre-Series A round. Deeptech investors rally behind our roadmap, united by a belief in fidelity and connectivity to build a universal quantum computer.

A breakthrough in coherence time for quantum states in carbon nanotubes sets world-class benchmarks. Our approach is validated in Nature Communications - the vision becomes science.

The team grows past 50 artisans of quantum, building with precision and purpose.

We open a second office across from the Panthéon, adding 600m² to shape what’s next.