Rhonexum, a Lausanne-based cryogenic electronics startup, has raised €867.5k ($1 million) in pre-Seed funding to accelerate product development and begin to commercialise its first product, designed to drive the development of scalable quantum computers to initial customers.
The round was led by QDNL Participations, with participation from Venture Kick. It has also received non-dilutive funding from leading Swiss innovation programmes. These include EPFL Startup Launchpad, Fondation pour l’Innovation Technologique (FIT), and the Swiss National Science Foundation (SNSF).
“We founded Rhonexum to become the key provider of cryogenic electronics for scalable quantum computers. Our goals are to enable the transition from lab-sized systems to practical, large-scale machines, optimise thermal-load losses and reduce cabling complexity. Our technology also has future strategic applications beyond quantum, such as in space and advanced sensing,” said Vicente Carbon, co-founder of Rhonexum.
Rhonexum was founded in November 2025 by Vicente Carbon and Dr Hung-Chi Han. It is a spin-out from AQUA Lab at the École Polytechnique Fédérale de Lausanne (EPFL). Dr Han is an expert in cryogenic semiconductor physics and transistor modelling, with publications in the field, and has previously worked at semiconductor giant TSMC. Carbon specialises in robotics and systems engineering, emphasising the application of advanced research into industry.
The company develops electronics that can operate at cryogenic temperatures close to absolute zero (-270 °C). It states that these temperatures are essential for technologies such as quantum computing, but conventional electronics cannot reliably function in these environments.
According to the Swiss startup, by using proprietary models and software tools, it can deliver electronics made using standard semiconductor processes that operate directly within cryogenic systems. Rhonexum claims to remove a major scalability bottleneck in quantum computing by designing electronics that operate close to the qubits at temperatures near absolute zero
“Cryogenic CMOS is an important emerging technology space. Rhonexum stands out with an internal software-driven modelling methodology that enables accurate cryogenic simulation before fabrication, allowing for faster and more cost-effective hardware development. We see real potential here, so we’re proud to support Vicente and Hung-Chi as they work to bring their first product to market,” said Kris Kaczmarek, investment director, QDNL Participations.
With the new funding, the company will speed up product development, grow the design team, and deliver an initial industrial-grade cryogenic electronics product to a select group of early customers, scheduled for later this year.
Read the orginal article: https://www.eu-startups.com/2026/03/lausanne-based-rhonexum-raises-e867-5k-to-advance-cryogenic-electronics-for-scalable-quantum-computing/
