UK-based Quantum Motion said on September 14, 2026 that it has finalized a second close of its Series C funding round, adding new investors to accelerate the industrial scale-up of its fault-tolerant silicon quantum processors.
The Round
The extension tranche was co-led by existing investors DCVC and Kembara, and brought in new and returning strategic and financial backers including imec.ventures, Lansdowne Partners, Sony Innovation Fund, S3 Ventures and Inkef. The additional funding builds on Quantum Motion’s original $160 million Series C round, positioning the company as one of the best-funded quantum computing firms in the UK.
Silicon-Spin Approach
Quantum Motion’s approach is built around silicon-spin qubits manufactured using standard 300mm CMOS semiconductor processes, rather than the superconducting or trapped-ion approaches used by many competitors. The company says this allows it to lean on existing commercial chip supply chains — including manufacturing partners such as imec and GlobalFoundries — rather than building entirely bespoke fabrication capability. The new capital will support continued custom silicon co-development, an expanded US research lab in Maryland, and participation in stage B of DARPA’s Quantum Benchmarking Initiative (QBI).
Why It Matters
Quantum computing developers face a persistent trade-off between qubit approaches that are easier to control today and approaches believed to scale more efficiently toward the large, fault-tolerant qubit counts needed for practical applications. By tying its architecture to existing semiconductor foundry processes, Quantum Motion is betting that manufacturing scale — not exotic materials or novel fabrication lines — will be the deciding factor in which qubit technology reaches commercially useful scale first. Continued institutional and strategic investment in silicon-based approaches also signals growing investor confidence that a CMOS-compatible path to quantum advantage is commercially viable alongside more established superconducting efforts from larger competitors.