C12

C12 Quantum Electronics is a Paris-based startup founded in January 2020, specializing in scalable quantum processors using carbon nanotubes.

The company aims to create utility-scale quantum computers by leveraging advanced materials science and innovative manufacturing techniques. C12 was established as a spin-off from the Physics Laboratory of the École Normale Supérieure and is led by twin brothers Pierre and Matthieu Desjardins. C12 develops CNT-based spin-qubit processors that offer enhanced qubit stability and lower error rates. Their Callisto Quantum Emulator is a cloud-based tool that allows developers to simulate quantum algorithms. The company has built a unique quantum chip production line and plans to make its quantum processors available on the cloud by the end of 2025, with physical chips expected to be sold in 2026. C12 also provides services to help industrial clients in the chemical and energy sectors integrate quantum computing into their operations.