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RF Engineer for Quantum Hardware

Permanent contract
January 2022

C12 develops reliable & application-specific quantum computers, to solve highly complex computing tasks, currently out of reach of even most powerful supercomputers.

Building a quantum computer still needs innovators ready to tackle exciting challenges. C12 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 minimizes 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 revolutionized classical computing.

Founded in 2020, C12 is a fast-growing start-up, having raised a seed round of USD 10 million in June 2021 and building its own lab space in the center of Paris.

C12’s unique technology

At C12, a qubit, the fundamental functional unit of a quantum computer, is built from an ultra-pure carbon nanotube suspended above a silicon chip containing control electrodes and a quantum communication bus. Spin qubits coupled to a microwave cavity brings interesting perspectives for their individual control and manipulation as well as for the circuit architecture. A suspended isotopically pure 12C nanotube holds great promises in terms of stability, as it reduces all sources of decoherence (charge noise, nuclear spin noise, phonon relaxation).

C12 encourages all who feel qualified to apply. Recruitment decisions are based solely on qualifications, skills, knowledge and experience.

Your role at C12 Quantum

Your main responsibility will be contributing to the design & optimization of passive on-chip distributed RF circuits for qubit control and performing & analyzing microwave simulations.

Developing, with research scientists and other hardware engineers, microwave simulations for the on-chip RF circuits and its 3D packaging

Identifying cross-talks and  loss mechanisms in RF circuits

Investigating discrepancies between simulated and achieved performance of fabricated devices

Develop a scalable architecture for routing the microwave signal (very low power) towards and between >100 qubits

Contributing to the continuous improvement of our simulation tools and their integration with Python-based custom layout/design tools

About you
  • Minimum 5+ years experience as an RF engineer
  • Experience developing electromagnetic simulations using industry standard tools such as HFSS, Maxwell, Comsol, or Cadence
  • Experience with designing and integrating microwave components and subsystems
  • Experience with  high-frequency (RF, microwave or mm-wave), IC or PCB design
  • Experience with design/development in Python
  • Good communication in English (verbal and written)
  • Experience in designing superconducting resonator is seen as an advantage
  • Knowledge of semiconductor device physics and microfabrication processes is seen as an advantage
  • Knowledge of fabrication principles and the constraints they impose on physical device parameters is seen as an advantage
You should join us if
  • You want to contribute to achieve landmark results in quantum computing, making a difference in the emerging quantum technologies
  • You want to work within an 18-people team with various backgrounds in nano-fabrication, quantum electronics and carbon nanotube science to materialize the vision of a revolutionary quantum computing processor
  • You want to thrive in a exceptional scientific environment with several industrial and academic partners
  • You relate to our values (excellence, scientific integrity, diversity, curiosity and care) and want to help us define our product-focus culture and ambition to accelerate
Submit your resume to join the quantum race