Quantum Measurement Expert

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C12 Quantum Electronics in Paris seeks a Quantum Measurement Expert to measure and characterize multi-spin qubit devices, develop multi-qubit experiments with spin qubits and microwave resonators, and push fidelities beyond the state of the art in a startup that values excellence, diversity, curiosity, and care. Ideal candidates hold a PhD in quantum physics, have postdoc or industry experience, and expert knowledge of semiconductor spin or superconducting qubits; hybrid CQED experience is highly valued, and mentoring is a plus. To apply, tailor your CV to showcase relevant experiments, quantify fidelities, highlight collaboration with design and theory, and show motivation to contribute to landmark quantum computing advances in Paris. Women are welcome.

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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 minimizes hardware overhead—key ingredients for scalable, fault-tolerant quantum computing. By crafting a unique approach that scales, we aim to revolutionize 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 spaces 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.
If you're passionate about shaping the future of quantum technology and want to make a real impact, C12 offers a unique environment to grow, learn, and innovate.

Your role at C12 Quantum Electronics

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

In collaboration with other scientists you will:
• Develop and perform multi-qubits experiments with spin qubits coupled to microwave resonators in collaboration with our chip design team
• Benchmark and improve fidelities of a single qubit gate, two-qubits 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 as an advantage.
• You have a good command 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 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 Quantum Electronics’ unique technologyAt 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.