C12

About the Company

C12 is building useful quantum computers by crafting the highest quality qubits using ultra-pure materials and perfected processes to control every individual electron.

Launched in 2020 by twin brothers Matthieu and Pierre Desjardins, C12 is a spin-off of the Physics Laboratory at the Ecole Normale Superieure in Paris. We are pioneering a new approach to quantum computing--using carbon nanotubes to create ultra-pure qubits, enabling better control, reduced noise, and a scalable hardware platform.

In June 2024, we raised EUR18 million in our second funding round, backed by Varsity, EIC Fund, Verve Ventures, and existing investors including 360 Capital, Bpifrance Digital Venture, and BNP Paribas Developpement. This follows a $10M seed round in 2021. With this support, we aim to demonstrate high-fidelity entanglement between distant spin qubits--a key step toward building large-scale, fault-tolerant quantum processors.

We have also inaugurated the Quantum Fab, our dedicated quantum production line in central Paris, and launched industrial collaborations across chemistry, optimization, and defense. Today, C12 operates from two offices on either side of the Pantheon, including a new space opened in 2025 to support our growing team.

C12 currently employs over 50 people across 20 nationalities, including 22 PhDs, all working towards one mission: to lead the next materials leap in quantum computing.

Silicon powered classical computing. It's time for carbon to do the same for quantum.

Listed Jobs

Company Name

C12

Job Title

Quantum Measurement Engineer (Entry Level / Internship )

Job Description

**Job Title** Quantum Measurement Engineer (Entry Level / Internship) **Role Summary** Assist the Quantum Measurement Team in developing, calibrating, and operating measurement and control systems for carbon‑nanotube based quantum processors. Provide data acquisition support, software scripting, and troubleshooting to enable accurate characterization of quantum devices. **Expectations** - Recent graduate or final‑year student in engineering, physics, or related field. - Willingness to learn new measurement tools and upgrade existing systems. - Strong initiative, detail orientation, and proactive problem‑solving in a collaborative research environment. - Effective communication in English, both oral and written. **Key Responsibilities** 1. Collaborate with senior engineers to design and build measurement setups for quantum devices. 2. Develop and maintain Python scripts for data acquisition, signal processing, and automated experiment control. 3. Perform routine calibration and maintenance of measurement hardware (e.g., lock‑in amplifiers, oscilloscopes, RF source). 4. Collect, process, and analyze measurement data, preparing clear reports and visualizations. 5. Troubleshoot hardware and software issues, proposing and implementing corrective actions. 6. Document measurement procedures, results, and lessons learned in standard formats. 7. Support the integration of new measurement technologies and protocols into existing workflows. **Required Skills** - Python programming (data handling, automation, basic visualization). - Fundamentals of electrical measurement and signal conditioning. - Basic signal‐processing concepts (filtering, Fourier analysis). - Knowledge of laboratory instrumentation (oscilloscopes, spectrum analyzers, signal generators). - Analytical mindset with strong quantitative skills. - Excellent written and verbal communication in English. - Ability to work effectively in a multidisciplinary team. **Required Education & Certifications** - Master’s degree (or final‑year undergraduate) in Engineering, Physics, Quantum Engineering, or Electrical Engineering. - No specific certifications required; coursework or projects involving quantum computing, nanofabrication, or signal processing is a plus.

Paris, France

On site

Fresher

03-11-2025

Company Name

C12

Job Title

Officier de Sécurité

Job Description

**Job Title** Security Officer – Defense Secret Protection **Role Summary** Ensure implementation of defense‑secret protection policy within the organization, safeguarding classified information, physical and digital assets, and maintaining regulatory compliance. Operates under the Operations Manager and coordinates closely with the Information Security Officer. **Expectations** - Uphold all defense‑secret regulations (IGI‑1300, Code de la Défense). - Maintain up‑to‑date security documentation and personnel habilitations. - Conduct audits, incident reporting, and continuous improvement of security controls. - Deliver training and awareness programs in English. - Provide regular reports to defense officials and senior management. **Key Responsibilities** 1. **Policy & Compliance** - Develop, update, and enforce the organization’s defense‑secret policy. - Ensure adherence to IGI‑1300 and applicable ministerial instructions. - Manage security documentation (plans, registers, procedures, role catalogues). 2. **Habilitation & Access Management** - Control software, physical, and contractor access to classified areas. - Identify roles requiring classified information access; manage personnel dossiers. - Liaise with habilitation authorities, conduct administrative investigations, and oversee revocation/renewal of authorizations. 3. **Information & Tele‑Surveillance Protection** - Secure physical and logical classified information and media. - Monitor and maintain access control, storage, and secure destruction systems. - Execute internal audits and security inspections; report incidents or compromises. 4. **Training & Awareness** - Design and deliver security and secret‑protection training (in English). - Conduct regular risk briefings on intrusion, data leakage, cyber threats, and espionage. 5. **Stakeholder Relations & Reporting** - Serve as primary liaison with the Defense Secret Officer (FSD) and information security officer on classified matters. - Prepare annual security activity reports for the FSD and organization leader. **Required Skills** - In‑depth knowledge of defense‑secret regulations (IGI‑1300, Code de la Défense). - Expertise in habilitation, classification, and security policy development. - Ability to conduct security audits and write comprehensive reports. - Strong cybersecurity and data protection fundamentals. - Discretion, rigor, and responsibility. - Excellent written and verbal communication in English. - Proficient stakeholder coordination (Defense, HR, technical services). **Required Education & Certifications** - Bachelor’s to Master’s (Bac+3 to Bac+5) in Security, Defense, Engineering, Public Law, or related field. - Prior experience in information security, safety, or defense secret management preferred. - Security‑related certifications (e.g., CISM, CISSP, ISO 27001 Lead Auditor) advantageous.

Paris, France

On site

31-12-2025