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

As a member of the quantum measurement team, your role will involve measuring and characterising multi‑spin qubit devices for the purpose of achieving quantum operations.

In collaboration with other scientists you will:

Develop and perform multi‑qubit experiments with spin qubits coupled to microwave resonators in collaboration with our chip design team.
Benchmark and improve fidelities of a single‑qubit gate and two‑qubit gate to go beyond state‑of‑the‑art results.
Work closely with the theory team to improve the devices’ performance and implement simple algorithms and error‑correction protocols.
Mentor and supervise the work of junior team members.

About you

You have a PhD in quantum physics.
You have a post‑doc or first experience in industry.
You have strong expertise in semiconductor spin qubits, or superconducting qubits.
Prior experience with hybrid CQED is highly valued.
Previous experience with multi‑qubit experiments is considered an advantage.
You have a good command of English (oral and written).

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 50‑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 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 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).
EEO Statement
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.
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