C12

Quantum Measurement Expert

Reposted 8 Days Ago

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Paris, Île-de-France

Hybrid

Mid level

Quantum Computing

The Role

Measure and characterize multi-spin qubit devices, develop experiments, improve fidelity, and mentor junior team members in quantum computing.

Summary Generated by Built In

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 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 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).

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.

Top Skills

Hybrid Cqed

Quantum Physics

Semiconductor Spin Qubits

Superconducting Qubits

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The Company

HQ: Paris

54 Employees

Year Founded: 2020

What We Do

C12 is building reliable quantum computers.

The company is a spin-off from ENS launched in January 2020 by twin brothers Matthieu and Pierre Desjardins to supercharge the development of the lab’s promising new quantum technology.

Quantum computing has the potential to change our lives. But frequent errors limit the technology’s viability. We are tackling the fundamental issue: the nature of the hardware itself. We are tapping into the simplest material–carbon–to drive a technological breakthrough in the field. Unlike other quantum computers, we use carbon nanotubes as the fundamental building block of our processor. By combining the power of an ultra-pure material with an easy-to-manufacture semiconductor device, we are building a scalable platform for quantum computing.

Our executive co-founders bring a unique combination of scientific excellence and business skills to the company. Our team is made up of the world’s most accomplished experts in quantum electronics and carbon nanotube science. Our scientific advisors are renowned scientists and pioneers in spin qubits: Dr. Takis Kontos, Dr. Matthieu Delbecq and Dr. Jérémie Viennot.

In June 2021, C12 secured a $10 million seed round with funding from 360 Capital, Bpifrance (Digital Venture Fund), Airbus Ventures, BNP Paribas Développement, and Octave Klaba (OVHcloud), and additional grants from Bpifrance and the Ile-de-France Region.

We are leading quantum’s next material breakthrough, and we are just getting started. Silicon enabled the emergence of classical computing – it’s time for carbon to do the same for quantum !