Rhonexum raises USD 1 million to advance cryogenic electronics for quantum computing

Lausanne-based deep-tech startup Rhonexum has raised USD 1 million in pre-seed funding, led by QDNL Participations, a specialist early-stage quantum technology venture capital firm, with additional participation from Venture Kick. The round also includes non-dilutive support from EPFL Startup Launchpad, the Fondation pour l’Innovation Technologique (FIT), and the Swiss National Science Foundation (SNSF).

Founded in November 2025 as a spin-out from EPFL’s Advanced Quantum Architecture Laboratory (AQUA Lab), Rhonexum develops electronics capable of operating at cryogenic temperatures near absolute zero, conditions essential for quantum computing but incompatible with conventional semiconductor components. The company’s proprietary modeling software and design tools allow engineers to simulate and verify cryogenic chip behavior before fabrication, using standard semiconductor processes. This approach reduces development costs and timelines by up to 90%, addressing one of the central scalability bottlenecks in the transition from laboratory quantum systems to large-scale machines.

Co-founder Dr. Hung-Chi Han brings published expertise in cryogenic semiconductor physics and transistor modeling, with prior experience at semiconductor manufacturer TSMC. Co-founder Vicente Carbon contributes a background in robotics and systems engineering, with a focus on translating deep-tech research into industrial applications.

The pre-seed funding will support product development, team expansion, and the delivery of a first industrial-grade cryogenic electronics product to a limited cohort of early customers later in 2026. Beyond quantum computing, Rhonexum identifies future applications in space technology and advanced sensing.

The raise follows a CHF 100,000 Tech Grant awarded to Rhonexum by FIT in September 2025, marking a rapid progression from early-stage validation to first external investment for the young Lausanne start-up.