C12
C12 is a Paris-based company developing carbon-based quantum computing hardware and software tools aimed at utility-scale, fault-tolerant quantum computing.
- Category
- Other hardware, Software and algorithms
- Technology
- carbon-based quantum computing using carbon nanotube physics
- Headquarters
- Paris, France
- Founded
- 2020
- Ownership
- Private company
- Funding
- Raised USD 10 million in seed funding in June 2021 and closed an €18 million pre-Series A round in June 2024, according to the company timeline.
- Products and platforms
- Callisto, QuantumTrack
- Key people
- Pierre Desjardins, Co-founder & CEO
Matthieu Desjardins, Co-founder & CTO
Juliette Ginies, Head of Operations
Nicolas Hauseux, VP of software development - Website
- c12qe.com
C12 is a quantum technology company focused on carbon-based quantum computing. Its website says it is building scalable quantum computers using carbon-based materials and architecture, with an emphasis on fault-tolerant quantum computing and utility-scale systems. The company states that it spun out of the ENS Physics Lab in Paris in 2020.
According to its About page, C12 was founded by Matthieu and Pierre Desjardins, with scientific advisors Takis Kontos and Matthieu Delbecq. The company reports a USD 10 million seed round in June 2021 and an €18 million pre-Series A round in June 2024. It also says it opened an 800m² fabrication hub in Paris in October 2023 and later added a second office space in May 2025.
C12’s materials describe its approach as carbon-based rather than silicon-based, including work on carbon nanotube physics, qubit control, and quantum device architecture. The company also says it released Callisto, a quantum emulator grounded in carbon nanotube physics, in June 2023.
Sources
Facts on this page come from the sources below, retrieved by DesignQuantum.
Last verified: October 28, 2026