# C12

C12 is a quantum company with an address in Paris, Île-de-France, France.

Builds carbon-based quantum computers using carbon nanotube qubits; named offerings include CALLISTO and Promethia Suite; developed a Pick & Place nanoassembly process for chip manufacturing; based in Paris.

## Details

- Address: 26 rue des Fossés Saint-Jacques, Paris, Île-de-France, 75005, France
- Website: [www.c12qe.com/](<https://www.c12qe.com/>)
- Source of the listing data: Listed on https://www.euroquic.org/members-list/; details checked on the organisation website https://www.c12qe.com/ on 2026-11-01.

## Questions

### Where is C12?

C12 is at 26 rue des Fossés Saint-Jacques, Paris, Île-de-France, 75005, France.

### How do I contact C12?

To contact C12, visit https://www.c12qe.com/.

## Source

From [Business websites](https://www.c12qe.com/), license Business website facts; website text and images retain their original rights., checked 2026-11-03.

Last updated November 3, 2026.

## Links

- This quantum company on the [web page](<https://quantumcompanies.fyi/fr/ile-de-france/paris/c12>)
- [Quantum hardware in Paris](<https://quantumcompanies.fyi/fr/ile-de-france/paris/category/quantum-hardware.md>)
- [More quantum companies in Paris](<https://quantumcompanies.fyi/fr/ile-de-france/paris.md>)