Experimental Quantum Physicist

C12; Paris; Sur place; EUR 60 000 - 90 000; Plein temps

Avantages offerts par ce poste

Stock options

Meal vouchers

Training budget

Remote conference attendance

Mental health support

Résumé du poste

C12, based in Paris, seeks passionate individuals to drive advancements in quantum computing. Join our innovative team developing pioneering technologies based on spin qubits within carbon nanotubes, aiming to create scalable quantum processors.

The role requires a commitment to scientific rigor and hands-on work, including optimizing experiments and collaborating across disciplines to connect theory with practical implementations.

We offer a stimulating environment, competitive salary, and stock options for employees, encouraging growth and exploration in quantum technology.

Qualifications

• Experience in quantum physics or related fields.
• Proficiency in Python for data processing and experimentation.
• Ability to communicate technical concepts clearly.

Responsabilités

• Design and optimize DC and microwave experiments.
• Develop scalable and reproducible measurement workflows.
• Collaborate effectively with engineering and theory teams.
• Enhance understanding of spin qubits in carbon nanotubes.

Connaissances

Hands-on experience with quantum experiments

Fluent Python programming

Scientific communication in English

Formation

PhD in quantum physics or related discipline

Outils

DC transport equipment

Microwave spectroscopy tools

Description du poste

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 80+, including 25 PhDs, has over 26 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.

Overview

C12 Quantum Electronics is developing a hybrid quantum architecture based on spin qubits in carbon nanotubes, coupled through a circuit quantum electrodynamics (cQED) platform. Our approach combines the exceptional coherence properties of carbon-based qubits with high‑connectivity microwave architectures, with the goal of building a fault‑tolerant quantum processing unit.

The Qubit Control team sits at the heart of this effort. We develop the methods that make qubits work: tuning protocols, readout strategies, gate implementations. We optimise the control and readout electronics and protocols, explore large parameter spaces, investigate the physics of the spin qubit, and translate physical insight into engineering solutions.

Working at the intersection of quantum physics, engineering, and software, you will collaborate daily with theory and the other engineering teams—all co‑located in our Paris lab to make those interactions as direct and continuous as possible.

C12 is transitioning from a phase of scientific discovery and proof‑of‑concept demonstrations to one of systematic scaling. This means our focus is shifting towards automation, reproducibility, and process maturity — without sacrificing the scientific rigor and curiosity that got us here.

Responsibilities

• Design, calibrate, and optimise DC and microwave experiments in dilution cryostats equipped with state‑of‑the‑art high‑frequency control electronics
• Develop scalable measurement and analysis workflows that are well‑documented, reproducible, and built to run with increasing autonomy
• Sustain a close feedback loop with engineering teams to continuously improve device performance
• Work closely with the theory team to connect experimental observations with physical models
• Actively collaborate with the software team to execute our automation roadmap — from experiment scheduling to data analysis — as we scale toward a full QPU
• Deepen our understanding of spin qubits in carbon nanotubes integrated within high‑impedance cQED architectures

About You

• You are driven by the scientific and engineering challenge of building a quantum computer, and you want to contribute to a meaningful milestone in the field
• You hold a PhD (or Masters with substantial research experience) in quantum physics or a closely related discipline
• You have hands‑on experience with quantum experiments — DC transport, microwave spectroscopy, or both
• You write Python fluently and use it autonomously to control experiments, process data, and build reusable tools
• You hold yourself to high scientific standards and are equally motivated by results
• You communicate clearly in English, in writing and in conversation, across technical and non‑technical audiences

What we offer

• 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
• Swile meal vouchers
• Vibrant office culture (team lunches, offsite events, Friday breakfasts)
• Mental health support with moka.care
• 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 team of 80+ people 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

Applications from women are encouraged and welcomed!

This is the salary range for a mid‑senior profile. That said, we still encourage you to apply, even if you don't meet all the requirements.