QuantumDiamonds raises €91m to push diamond-based quantum tech

QuantumDiamonds has raised €91m in new funding, with World Fund and IQ Capital named among the investors participating in the round. The capital injection puts a spotlight on diamond-based quantum technology as deep-tech and climate-focused funds step further into the quantum hardware landscape.

QuantumDiamonds works on quantum technology that relies on diamond materials at its core. Rather than building general-purpose quantum computers in the way some superconducting or trapped-ion players do, diamond-based quantum approaches are often explored for applications such as highly sensitive sensors, secure communication, or specialised computing functions. The company’s focus places it in a segment of the quantum market where performance can hinge on material science and precision engineering as much as on algorithms and software.

The quantum sector itself continues to attract large, concentrated rounds for hardware players, in contrast with the more fragmented financing seen in quantum software and services. Investors have been looking for architectures that can scale, tolerate environmental noise, and support commercially relevant use cases in areas like industrial monitoring, navigation, and infrastructure. Diamond-based systems are part of that exploration because of their potential for high stability and operation at relatively accessible conditions, compared with some competing quantum modalities that demand more extreme environments.

In this context, a €91m round is a significant signal of confidence. World Fund, known for backing technologies that can contribute to climate and sustainability outcomes, and IQ Capital, an investor with a track record in advanced deep-tech, are among the backers supporting this raise. While the company has not publicly framed this round in terms of a specific named stage, the cheque size places QuantumDiamonds alongside some of the better-capitalised quantum hardware startups in Europe. For founders tracking capital formation in the sector, it marks another example of specialist VCs stepping up with sizable rounds for technically ambitious hardware plays.

The infusion of €91m gives QuantumDiamonds room to extend its R&D roadmap, refine its core diamond quantum devices, and move closer to industrial-grade reliability. For hardware companies in quantum, these milestones are capital-intensive: scaling fabrication processes, recruiting specialised engineering and physics talent, and validating performance with early customers or research partners all require multi-year investment. While the precise deployment plan for the new capital has not been detailed, the amount alone suggests a focus on deepening the technology moat and edging toward commercial readiness rather than small, incremental experiments.

For other founders in quantum and adjacent deep-tech fields, this round underlines several trends. First, there is clear investor willingness to underwrite substantial hardware risk where the underlying physics and materials science present a credible path to differentiation. Second, thematically focused funds like World Fund are now visibly active in quantum, especially where potential climate or industrial impact is part of the story. And third, the financing scale signals that competing for leadership in quantum hardware may increasingly require rounds at this magnitude, not only for computing but also for sensing and communication platforms.

What happens next will revolve around execution. With this level of funding, QuantumDiamonds will be expected to translate scientific advances into demonstrable products or pilot deployments, prove that its diamond-based approach can be manufactured repeatably, and show progress toward commercial contracts rather than purely research collaborations. On the investor side, peers will be watching whether this round catalyses follow-on financings in similar materials-driven quantum startups, or whether capital remains concentrated in a handful of hardware bets. For founders, the company’s ability to hit technical and commercial milestones over the next funding cycles will be a useful benchmark for what it now takes to build a venture-backed quantum hardware business in Europe.