Head of Qubit Control

Founded in 2020 and based in the heart of Paris, C12's mission is to be at the center of one of the biggest technological breakthroughs of the century, and change the course of history by building a universal quantum computer.

At C12, we believe that achieving a true breakthrough in quantum computing requires rethinking the fundamentals. That's why our founders—deeply rooted in academic and engineering excellence—have chosen carbon nanotubes as the building blocks of our quantum processors. This ultra-pure material dramatically reduces error rates, boosts performance, and minimises hardware overhead—key ingredients for scalable, fault-tolerant quantum computing. By crafting a unique approach that scales, we aim to revolutionise quantum computing just as silicon transformed classical computing.

Since our founding, we've raised over €25 million in funding, published 11 scientific papers, and secured 8 patents. Today, our fast-growing team of 60, including 20 PhDs, has over 20 nationalities represented. We have our own cutting-edge lab space in Paris' historic Panthéon district; where scientists, engineers, and innovators work side-by-side to tackle some of the most exciting technical challenges of our time.

As Head of Qubit Control, reporting directly to the CTO, you will lead and grow a team of quantum physicists, from junior level to recognised experts, responsible for the performance of C12's quantum operations. You will lead the expansion of the team that is expected to become one of the largest teams within the company. The team's work focuses on the control and readout of 1- and 2-qubit gates on small- and large-scale chips, including optimisation of control and readout electronics, efficient exploration, tuning, and optimisation of large parameter spaces, and experimental investigation of the underlying physics. The quantum chips operate at low temperatures in cryostats hosted in our cryolab, equipped with state-of-the-art high-frequency microwave control electronics. Your role is to enable excellence in qubit control, measurement, and calibration by structuring execution, aligning priorities, and supporting technical decision-making, while relying on deep expertise within the team and working closely with leadership to deliver results aligned with the company's R&D roadmap.

Your key responsibilities include:

• Growing and recruiting key talents, mainly research scientists from junior level to experts.
• Fostering and maintaining high standards for project management within the team, acting as a coordinator and enabler when needed, while day-to-day execution and ownership are led by team members, with arbitration support from the CTO when deeper technical decisions are required.
• Defining the team OKRs under the guidance of the CTO and the R&D Operations Lead, and own their delivery.
• Ensuring strong collaboration across teams, in particular with the software and theory teams.
• Maintaining a high level of experimental operations, in close collaboration with the support team, ensuring infrastructure reliability, and efficient lab usage

• You have at least 5 years of experience leading technical or research teams composed of highly skilled members with diverse technical backgrounds
• You have a background in physics, quantum physics, or electrical engineering or in a related field; a PhD is considered an advantage but not mandatory
• You bring multidisciplinary experience, in particular strong exposure to data analysis and/or software-driven workflows
• You demonstrate strong organisational, communication, and prioritisation skills, enabling effective coordination across teams and expertise levels.

• Stock options for every employee (BSPCE/ESOP)
• Two incredible office spaces in the heart of Paris (both next to the famous Panthéon)
• Sponsored trip to conferences around the world
• A highly dynamic international team
• Swile meal vouchers
• Vibrant office culture (team lunches, offsite events, Friday breakfasts..)
• Mental health support with
• Training budget/ Annual Learning & Development Allowance
• Sabbatical leave (after 2 years in the company)

You should join us if...

You like hands-on work and technology

You want to contribute to achieving landmark results in quantum computing, making a difference in the emerging quantum technologies

You want to work within a 60-people team with various backgrounds in nanofabrication, quantum electronics, and carbon nanotube science to create a revolutionary quantum computing processor

You want to thrive in an exceptional scientific environment with several industrial and academic partners

You share our values (excellence, scientific integrity, diversity, curiosity, and care) and want to help us define our product-focused culture and ambition to accelerate.

C12 encourages all who feel qualified to apply. Recruitment decisions are based solely on qualifications, skills, knowledge and experience. Applications from women are particularly welcomed.

We may use artificial intelligence (AI) tools to support parts of the hiring process, such as reviewing applications, analyzing resumes, or assessing responses. These tools assist our recruitment team but do not replace human judgment. Final hiring decisions are ultimately made by humans. If you would like more information about how your data is processed, please contact us.