Nanofabrication Intern

C12 develops reliable & application-specific quantum computers, to solve highly complex computing tasks, currently out of reach of even 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. 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).

• As a member of the nanofabrication team, you will contribute to the development of carbon nanotube-based spin qubit devices, which consist of multiple building blocks. The high performance of these devices at cryogenic temperatures is heavily dependent on the quality of each component. This role involves investigating the quality factor of superconducting resonators made from high-kinetic superconductors, fostering a deep understanding of how material selection and nanofabrication processes influence electrical performance. The focus will include material science, processing, and characterisation techniques, such as SEM, EDX, AFM, and room-temperature electrical probing.

• Literature review on relevant subjects and sharing your summaries with the team.
• Fabrication of devices and the following characterisation. 
• Performing data analysis and preparing/contributing to reports/presentations.
• Participating in weekly team meetings and report your weekly progress on projects.
• Gaining experience and eventually proposing improvements.
• Assisting in daily process operations.

• You are at the end of your bachelor or master in physics, engineering, or any related field.
• You speak and write English fluently.
• You are self-motivated and are able to work independently.
• You are familiar with characterisation techniques (SEM, EDX, AFM, etc).
• You are familiar with electrical characterisation techniques (2-, 4- point).
• You are rigorous and meticulous.
• Cleanroom operation experience is a plus.
• You are enthusiastic and carry positive energy.
• You have the start-up mindset (growing and creative environment)

You should join us if…

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 Quantum Electronics’ 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 promises in terms of individual control and manipulation as well as for the circuit architecture. A suspended isotopically pure 12C nanotube holds great promises in terms of stability, as it reduces all sources of decoherence (charge noise, nuclear spin noise, 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.