Delft-based quantum hardware startup FrostByte raised €1.3 million in pre-seed funding on May 7, 2026, backed by InnovationQuarter Capital, Graduate Ventures, Paeonia Group, UNIIQ, and an angel investor. Founded in 2025 as a TU Delft and QuTech spin-out, the company develops cryogenic control electronics — including RF switches and cryo-CMOS chips — designed to operate at millikelvin temperatures inside quantum computers. The capital will fund team growth and production scaling, targeting a critical industry bottleneck: the wiring complexity that currently prevents quantum computers from reaching fault-tolerant scale.
In-Depth:
Key Takeaways
- Delft-based FrostByte closed a €1.3 million pre-seed round from five backers: InnovationQuarter Capital, Graduate Ventures, Paeonia Group, UNIIQ, and an angel investor
- The raise marks Graduate Ventures’ 80th portfolio investment in exactly five years, with the firm citing quantum, AI, and climate tech as core focus areas
- FrostByte was founded in 2025 as a spin-out of TU Delft and QuTech, building on over 10 years of cryogenic chip research at those institutions
- Capital will fund team expansion, production scaling of cryogenic RF switches, and development of integrated cryo-CMOS chips designed to operate at millikelvin temperatures, directly adjacent to quantum processors
Quick Recap
Delft-based quantum hardware startup FrostByte has announced the close of its €1.3 million pre-seed funding round, as reported by EU Startups on May 7, 2026. The round was backed by InnovationQuarter Capital, Graduate Ventures, Paeonia Group, UNIIQ, and an undisclosed angel investor. The company, spun out of TU Delft and QuTech in 2025, is building cryogenic control electronics designed to eliminate the wiring bottleneck that currently prevents quantum computers from scaling beyond tiny prototypes.
Cryo-CMOS: The Hardware Fix Quantum Scaling Desperately Needs
Every qubit inside a quantum computer today requires its own dedicated chain of room-temperature control electronics connected via cables running into a cryostat that operates near absolute zero. As qubit counts grow from dozens toward the millions necessaryed for fault-tolerant quantum computing, this architecture collapses under the weight of its own cabling, heat generation, and complexity.
FrostByte’s answer is to bring the control electronics inside the fridge. Its cryo-CMOS integrated circuits are designed to operate reliably at millikelvin temperatures, right next to the qubits themselves, replacing bulky room-temperature switching hardware with compact, low-power on-chip components.
The company’s first commercial products are a family of cryogenic RF switches that handle signal routing inside the cryostat, covering a range of frequencies and drawing only a fraction of the power of their room-temperature counterparts. CEO James Kroll stated the funding will shift the technology toward “manufacturable cryo-electronics for the global quantum industest,” a deliberate emphasis on the step that most deep-tech quantum startups fail to reach: bridging from lab prototype to supply chain.
The scientific advisory bench is equally deliberate. Professors Fabio Sebastiano and Masoud Babaie, both recognized TU Delft pioneers in cryo-CMOS research, provide the technical backbone, while CTO Luc Enthoven leads the chip design execution. UNIIQ’s investment manager Mike Theunissen described FrostByte as addressing “a bottleneck the entire quantum sector is running into,” pointing to the team’s combination of deep scientific expertise with a clear, product-first roadmap.
A Bottleneck Race With High Stakes
The cryogenic control chip problem is not academic. It is the single most cited barrier to reaching the qubit counts at which quantum computers become genuinely applyful for real-world computation. The European quantum ecosystem has already seen significant capital flow into the control electronics layer: Finnish startup SemiQon raised €17.5 million in February 2025 via the European Innovation Council for its cryo-CMOS transistor program, tarreceiveing a jump from Technology Readiness Level 6 to 8 within two years.
At the infrastructure level, Israeli quantum control giant Quantum Machines raised $170 million in a Series C in February 2025, bringing its total funding to $280 million and claiming that more than 50 percent of all quantum computing companies globally now apply its technology. FrostByte enters this landscape at pre-seed, but its geographic position inside the QuTech ecosystem, one of Europe’s deepest quantum research concentrations, gives it a structural head start on credibility and talent acquisition.
EU policy is also pushing in the same direction: the European Quantum Flagship program has allocated over €1 billion to quantum research across member states, creating a procurement and validation pipeline that hardware startups like FrostByte can tap long before mass commercial markets arrive.
Competitive Landscape
FrostByte’s two most direct peers at a comparable technology layer are SemiQon (Helsinki, cryo-CMOS transistor developer) and Quantum Machines (Tel Aviv, quantum control systems hardware). Note that the table below adapts the comparison columns to hardware-relevant metrics rather than the AI model framework.
| Feature/Metric | FrostByte | SemiQon | Quantum Machines |
| Core Product | Cryogenic RF switches + integrated cryo-CMOS control chips | Cryo-CMOS transistors and chip components for quantum processors | Full-stack quantum control hardware and software (OPX1000 system) |
| Funding Stage | Pre-seed, €1.3M (May 2026) | Series-equivalent, €17.5M total (Feb 2025) | Series C, $280M total (Feb 2025) |
| Operating Temperature Tarreceive | Millikelvin (inside cryostat) | 1 Kelvin or below | Room-temperature control, with cryogenic filtering accessories |
| Production Approach | Standard commercial CMOS foundry processes | European pilot foundries (Micronova) | FPGA-based (AMD UltraScale+) with proprietary firmware |
| Tarreceive Customer | Quantum hardware developers, research labs | Quantum processor developers, HPC, space sectors | 50%+ of all quantum computer developers globally |
| Academic Origin | TU Delft / QuTech (2025 spin-out) | VTT Technical Research Centre, Finland (2023 spin-out) | Founded indepconcludeently by three physics PhDs, 2018 |
Strategic Analysis
FrostByte holds a differentiated edge in the “last-meter” integration challenge: its RF switch family tarreceives the specific in-cryostat routing problem that neither SemiQon nor Quantum Machines directly addresses at the component level. SemiQon is the closer technology peer but is already a funding round ahead and is actively shipping transistors to test customers, meaning FrostByte necessarys to execute its productization roadmap quicker than its runway implies.
TechnoTrenz’s Takeaway
I want to be honest about something: €1.3 million is a very tiny number in a space where competitors are raising hundreds of millions. And yet, I consider this announcement is more interesting than its size suggests. In my experience tracking deep-tech hardware rounds, the companies that eventually become critical infrastructure often start in exactly this way: a very specific, very unsolved problem, a team that has lived inside that problem for a decade through their research, and early investors who understand that the moat is the physics expertise, not the capital.
What FrostByte is doing is essentially proposing a new architecture for quantum computers, one where the control plane shifts inside the cryostat rather than sitting outside it. If that architecture becomes standard, whoever owns the cryogenic chip IP becomes a toll booth on the entire quantum computing supply chain.
That is a genuinely large potential outcome. I am cautiously bullish here, with two honest caveats. First, the productization leap from academic prototype to foundry-manufactured component is historically where cryo hardware startups stumble. Second, SemiQon is further along, better funded, and already in customer testing. FrostByte will necessary to find a distinct beachhead rather than competing head-on on the same transistor turf.
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