Quantum computing startups in the United Kingdom are leading one of the most significant technological revolutions of our time. Seedtable data shows that a core group of UK quantum startups have raised over $328.7 million in aggregate funding, with the broader ecosystem boosted further by large late-stage rounds at companies like Quantinuum, Quantum Motion, and ORCA Computing.
The UK quantum ecosystem spans hardware, software, cybersecurity, and networking infrastructure. From Cambridge research labs to London deep-tech hubs, these ten quantum computing startups – and scaleups – are the ones to watch in 2025.
Table of Contents
1. Quantinuum – The UK’s Quantum Champion
Website: https://www.quantinuum.com
Quantinuum is the UK’s flagship quantum computing company, formed by merging Cambridge Quantum and Honeywell Quantum Solutions in 2021. In 2025, Honeywell and Fidelity led a $600 million capital raise that valued Quantinuum at around $10 billion, making it one of the most valuable quantum companies globally.
The company develops trapped-ion quantum computers and a full software stack for chemistry, materials, cybersecurity, and quantum AI, and has been selected by DARPA to advance a major quantum benchmarking programme.
2. Oxford Quantum Circuits – Compute-as-a-Service Pioneer
Website: https://oqc.tech or http://oxfordquantumcircuits.com
Oxford Quantum Circuits (OQC) is a leading UK quantum hardware company delivering quantum-compute-as-a-service via cloud platforms and data centres. Founded in 2017 by Oxford physicist Peter Leek, OQC uses a patented 3D “Coaxmon” superconducting architecture designed for scale and reliability.
With around $150 million raised, OQC offers enterprise-ready quantum systems through the cloud and colocated deployments, targeting finance, national security, pharma, and advanced materials.
3. Nu Quantum – Record-Breaking Network Innovator
Website: https://www.nu-quantum.com
Nu Quantum is building quantum networking hardware to connect quantum processors into distributed, large-scale systems. Spun out of the University of Cambridge’s Cavendish Laboratory in 2018, the company focuses on entanglement distribution, optical switching, and quantum networking units to create multi-node quantum computers.
In December 2025, Nu Quantum closed a landmark $60 million Series A round led by National Grid, the largest known financing for a quantum computer networking startup, cementing its role at the heart of the future quantum internet.
4. Post-Quantum – Cryptography Defenders
Website: https://post-quantum.com
Post-Quantum develops quantum-resistant encryption and signature schemes designed to protect data and identities from future large-scale quantum computers. Headquartered in London, the company has raised about $11.2 million across four funding rounds to secure financial services, government systems, and blockchain environments against quantum attacks.
Its technology includes quantum-safe key exchange and digital signatures suitable for high-assurance applications, positioning Post-Quantum as a key UK player in the post‑quantum cryptography race.
5. Crypto Quantique – Quantum Cybersecurity Specialists
Website: https://www.cryptoquantique.com (company site referenced from Seedtable profile)
Crypto Quantique is a London/Surrey-based quantum cybersecurity company that uses quantum effects in silicon to generate unclonable device identities and secure IoT deployments. With $8 million raised over two rounds, its technology provides a hardware root of trust that remains robust even in a post‑quantum world.
The company targets industrial, automotive, and enterprise IoT markets, allowing devices to authenticate securely without relying on vulnerable, purely software-based keys.
6. Crypta Labs – IoT Security Leaders
Website: https://www.cryptalabs.com (industry listings reference this domain; Seedtable lists the startup and team)
Crypta Labs is a quantum security startup developing a Quantum Random Number Generator (QRNG) and integrated security chip for mobile and IoT devices. The company has raised $4.7 million across three funding rounds and focuses on sectors such as transport, defence, and healthcare where strong randomness is essential for cryptography.
By using quantum processes to generate truly random numbers, Crypta Labs improves the strength of encryption keys and makes it harder for attackers to predict or brute‑force secure communications.
7. Rahko – Quantum Discovery Platform
Website: https://rahko.ai (domain widely associated with the company; Seedtable lists Rahko and its founders)
Rahko is building a quantum discovery platform for chemical simulations, combining quantum algorithms and machine learning to accelerate R&D in materials and drug discovery. The London‑based startup has raised about $1.6 million and partners with major technology providers to test near‑term quantum advantage on realistic chemistry workloads.
Its tools aim to model complex molecules more efficiently than classical methods, opening paths to new pharmaceuticals, catalysts, and advanced materials.
8. Phasecraft – Algorithm Experts
Website: https://phasecraft.io (official site used in UK quantum company directories)
Phasecraft focuses on quantum algorithms and error‑optimised techniques for today’s noisy intermediate‑scale quantum (NISQ) devices. Spun out of UCL, Bristol, and Bath in 2019, the company has raised about £8.2 million to work on algorithms for materials, condensed‑matter physics, and optimization problems.
By improving algorithms rather than just hardware, Phasecraft aims to unlock practical value from relatively small quantum processors years before fully fault‑tolerant machines arrive.
9. ORCA Computing – Photonic Quantum Systems for AI
Website: https://orcacomputing.com
ORCA Computing develops full‑stack photonic quantum computers built from telecom‑grade components and proprietary quantum memories. Founded in 2019 as an Oxford spin‑out and headquartered in London, ORCA raised a $15 million Series A and now leads an £11.6 million UK “Quantum Data Centre of the Future” project with partners including BP, BT, Airbus, and the National Quantum Computing Centre.
Its rack‑mounted, air‑cooled systems are designed for data‑centre environments and target workloads such as generative AI and optimization, integrating with standard Python, PyTorch, and CUDA‑Q toolchains.
10. Quantum Motion – Silicon-Based Quantum Chips
Website: https://quantummotion.com
Quantum Motion is a London‑based startup building silicon‑based quantum processors using CMOS‑compatible manufacturing processes. Founded in 2017, the company has raised more than £62 million, including a £42 million investment round led by Bosch Ventures to accelerate development of scalable silicon qubit arrays.
By leveraging the same technology and fabrication methods used in conventional semiconductor chips, Quantum Motion aims to pack large numbers of qubits into compact devices and integrate quantum processors into established silicon supply chains.
The outlook for 2026 is even more futuristic, with the UK shifting from experimental pilots to integrated national quantum infrastructure. Government roadmaps now tie quantum systems directly into a £2 billion compute strategy, long‑term NQCC funding, and AI Growth Zones, signalling that British quantum hardware and software will sit alongside GPUs and supercomputers rather than in separate labs.
By 2026, leading UK startups like Quantinuum, Nu Quantum, ORCA Computing, and Quantum Motion are expected to move closer to real quantum advantage in chemistry, AI, networking, and security supported by new public investments of at least £121 million and dedicated programmes to turn prototypes into production‑grade platforms. For founders, investors, and enterprises, 2026 will be the year to treat UK quantum not as a distant bet, but as a strategic capability to build into products, data centres, and national infrastructure.
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