Swiss startup Rhonexum has raised $1 million to develop electronics that operate at cryogenic temperatures, tackling one of quantum computing’s biggest scalability challenges.
Rhonexum, a Swiss quantum technology startup spun out of the École Polytechnique Fédérale de Lausanne, has raised $1 million in pre-seed funding to develop electronics capable of operating at the extreme low temperatures required for quantum computing — a technical barrier that has constrained the scalability of quantum systems for years.
The round was led by QDNL Participations, with participation from Venture Kick and additional grant support from Swiss innovation programs, including EPFL Startup Launchpad, Fondation pour l’Innovation Technologique and the Swiss National Science Foundation.
Quantum computers require operating conditions close to absolute zero — temperatures at which conventional electronics fail. The standard workaround has been to keep control electronics at room temperature and route connections into the cryogenic environment, an approach that works at a small scale but becomes increasingly unwieldy as the number of quantum bits grows.Â
Rhonexum’s approach is to design components using standard semiconductor manufacturing processes that can function reliably inside the cryogenic environment itself, bringing control electronics physically closer to the quantum processor and reducing the complexity and wiring overhead that currently limits how large quantum systems can practically become.
Also Read: LlamaCon 2025 – Key Updates for Developers and the AI Ecosystem
The company was founded by Vicente Carbon and Dr. Hung-Chi Han, drawing on expertise in cryogenic semiconductor physics, systems engineering and the industrialization of deep technology. It was developed within EPFL’s AQUA Lab.
Carbon said the company’s goal is to become a foundational supplier of cryogenic electronics for scalable quantum systems, supporting the transition from laboratory setups to large-scale commercial machines.
Rhonexum plans to deliver its first industrial-grade cryogenic electronics product to a group of early customers later this year. The company said potential applications extend beyond quantum computing into space technologies and advanced sensing.
