FrostByte Secures €1.3 M to Build Millikelvin RF Switches for Quantum Computers

Context Quantum processors require thousands of control lines that currently run from room‑temperature electronics down to the ultra‑cold environment where qubits operate. As the industry moves from hundreds to millions of qubits, the bulk and power draw of these external components become a physical bottleneck. Re‑engineering control hardware to sit inside the cryostat— the insulated chamber that maintains temperatures near absolute zero—could cut cabling, reduce heat load, and lower system cost.

Key Facts - FrostByte announced €1.3 million in pre‑seed funding. Investors include UNIIQ, Paeonia Group, InnovationQuarter, Graduate Ventures and an angel backer. - The startup’s first product line targets cryogenic RF (radio‑frequency) switches that function at millikelvin temperatures, the same range used by superconducting qubits. - By placing these switches inside the quantum cryostat, FrostByte aims to replace bulky room‑temperature switching gear, shrinking the overall footprint of control electronics. - The launch received support from QuTech, Delft University of Technology and YES!Delft, institutions active in quantum research and technology transfer. - Founders James Kroll and Luc Enthoven rely on prior cryo‑CMOS (complementary metal‑oxide‑semiconductor designed for cryogenic operation) work by advisors Fabio Sebastiano and Masoud Babaie.

What It Means If FrostByte’s switches achieve reliable operation at millikelvin levels, quantum hardware designers could integrate control circuitry directly into the cryostat. This integration would reduce the number of coaxial cables that currently dominate cryostat volume, lower thermal load, and cut the power budget needed for signal amplification. The resulting density gains could accelerate the transition from prototype devices to commercial quantum processors with millions of qubits.

The funding round gives FrostByte the capital to move from prototype to small‑scale production while validating performance in real quantum systems. Success will depend on meeting stringent reliability standards and convincing chip manufacturers to adopt the new components.

What to watch next Follow FrostByte’s prototype demonstrations and any partnership announcements with quantum hardware vendors, as these milestones will indicate how quickly cryogenic control electronics could become mainstream.