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.

Your role at C12 Quantum Electronics:

As part of the CNT Engineering team at C12, you will help develop and operate our optical spectroscopy setups to characterize and select the ultra-pure carbon nanotubes (CNTs) used to assemble our qubits.

Key responsibilities:

Operation and continuous improvement of the of the Rayleigh and Raman spectroscopy setups

Design and build new optical setups under controlled atmosphere to further improve the optical characterization of our CNTs

Write automated procedures to characterize our CNTs at a very high pace

Work with the software team to improve our internal database

Write scripts for signal processing and statistical analysis of our spectroscopy data

About You:

Engineering diploma or Master’s degree in Optics, Physics, Applied Physics, Materials Science or other related field; past work experience or a PhD is also appreciated

You love both programming (in python) and experimental lab work

You have some experience in hardware and experimental setup design and fabrication

You like collecting, organising and analysing your data

You are detail-oriented and organized in your work and documentation style

You are diligent, autonomous, result-oriented and have a problem-solving attitude

Very good communication in English (verbal and written) is essential

Preferred traits :

Experience with mechanical design

Experience in materials characterization techniques (SEM, TEM, AFM, probe station)

Experience with micro and nano piezo actuators

Experience in carbon nanotubes

Experience with vacuum systems

What we offer:

48,000 euros - 62,000 euros yearly base salary
Stock options for every employee (BSPCE/ESOP)
Sponsored trip to conferences around the world
A highly dynamic international team
Swile meal vouchers
Mental health support with moka.care
Training budget/ Annual Learning & Development Allowance
Sabbatical leave (after 2 years in the company)
Vibrant office culture (two office spaces in the heart of Paris, team lunches, offsite events, Friday breakfasts..)

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

We still encourage even if you don’t meet all the requirements. Rest assured, we are committed to finding the right fit for our team and are open to adjusting compensations based on skills and experiences.

Applications from women are especially welcomed!

C12 Quantum Electronics

Research Engineer in Optics

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C12 Quantum Electronics

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