C12 develops quantum computers, to solve highly complex computing tasks, currently out of reach of even the most powerful supercomputers. Building a quantum computer still needs innovators ready to tackle exciting challenges. C12’s founders are convinced that only a new material for the qubit will bring a technological breakthrough. C12 uniquely uses carbon nanotubes as the fundamental building blocks of its quantum processor. This high-purity material minimises errors, radically improves performance and reduces hardware overhead for fault-tolerant computing. Combined with well-established semiconductor techniques, carbon nanotubes will help scale quantum computing, just as silicon revolutionised classical computing.

Our unique & innovative quantum computing technology enables us to address use cases, solving intractable problems our industrial customers are facing.

Founded in 2020, C12 is a fast-growing start-up, who recently raised EUR 18 million in 2024 to further its research in its own lab in the heart of Paris (Panthéon).

Your role at C12 Quantum Electronics

- Under the supervision of our Head of CNT Growth, you will contribute to the highly specific synthesis of Carbon Nanotubes by Catalytic Chemical Vapour Deposition (CVD) process by designing, conducting and analysing complex experiments.

Your job will involve:

Designing and conducting both liquid and gas-phase chemistry experiments Optimising the catalyst chemical formulation and deposition techniquesOptimising the CVD parameters (gas, rates, temperature, pressure, …) for better specificityImproving the spin qubit fidelity with isotopically purified carbon precursorsContinuous improvement of the CVD setup (hardware) and process (improving the control software is optional)Improving the current understanding of CNT growth mechanismWorking closely with the CNT Characterisation team (SEM, Raman, Rayleigh) to measure CNT diameter, band gap, defects, chirality.

About you

- You have at least an engineering diploma or master’s degree in chemistry, physics or a related field; a PhD or one past work experience is also appreciated
- You love experimental lab work
- You have some experience in experimental setup design and fabrication
- You like collecting, organising and analysing your data
- You can anticipate and plan your experiments in advance
- A prior experience with carbon nanotubes, CVD or other cleanroom processes is a plus but not required
- You are diligent, independent, result-oriented and have a problem-solving attitude
- You are detail-oriented and organised in your work and documentation style
- You have excellent written and verbal communication skills in English.

You should join us if...

You want to have a key role in a growing startup with challenges at the frontier of the 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 40-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’s unique technology

At C12, a qubit, the fundamental functional unit of a quantum computer, is built from an isotopically ultra-pure 12C nanotube suspended above a silicon chip containing control electrodes and a quantum communication bus. Our spin qubits hold great promise in terms of individual control and manipulation as well as for the circuit architecture. A suspended isotopically-pure 12C nanotube holds great promise in terms of stability, as it reduces all sources of decoherence (charge noise, nuclear spin noise and phonon relaxation).

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.

C12 Quantum Electronics

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