OQC Raises £260 Million, Setting a European Quantum Record

Oxford Quantum Circuits (OQC), the University of Oxford spinout building superconducting quantum computers directly inside commercial data centers, closed a £260 million ($350 million) Series C funding round on June 3, the largest private quantum computing funding raise in European history. Bullhound Capital led the oversubscribed book; the British Business Bank, Rokos Capital Management, and more than a dozen other institutional names backed it. J.P. Morgan served as exclusive placement agent.

The capital goes into expanding OQC’s international deployments and accelerating the company’s next-generation hardware platform, targeted for 2028. Per Roman, founding partner of Bullhound Capital, joins OQC’s board alongside existing board member Nigel Higgins, chair of Barclays. The announcement landed on the same day as the Prime Minister’s opening speech at London Tech Week.

The Investor Stack

The round was oversubscribed. At £260 million, that means allocations were cut; investors who wanted in did not receive full allocations. New backers include Fynveur (advised by Invus), COFIDES, RCM Private Markets Fund managed by Rokos Capital Management, Alpha Edison, Fulcrum Asset Management, Pentland Ventures, Magdalen College Oxford, Adaptive Capital Partners, Firgun Ventures, 18 West, Oxford Capital, and Mastercard. All five existing investors returned: Oxford Science Enterprises, SBI, Chevron Technology Ventures, the University of Tokyo Edge Capital Partners, and OTIF Ventures.

The roster’s breadth matters as much as its headline number. Firgun Ventures is a dedicated quantum fund managing $250 million; its participation confirms OQC cleared due-diligence scrutiny from specialists running nothing but quantum bets. The University of Tokyo Edge Capital Partners, returning from the prior round, anchors OQC’s Japanese investor base alongside active hardware deployments in Japan. COFIDES, Spain’s government-backed development finance institution, enters alongside the British Business Bank, giving OQC sovereign-linked capital from two countries where it has live hardware deployed. Chevron Technology Ventures brings industrial demand from the energy sector, where quantum algorithms for resource optimization and materials simulation form a separate commercial track from financial services and defense. “OQC is building one of the most compelling quantum computing platforms globally, with the technology, infrastructure and customer focus required to scale,” said Per Roman, founding partner of Bullhound Capital, at the June 3 Series C announcement.

Coaxmon Inside the Data Center

The 3D Architecture

OQC’s processors are built on sapphire, using a type of superconducting qubit called a transmon. A transmon’s core is a Josephson junction: a thin insulating layer sandwiched between two superconductors. Cooled near absolute zero, electron pairs tunnel through the insulator, and OQC’s chips run calculations by harnessing that behavior. Resonators on the reverse face of the sapphire substrate extract computation results during each operation cycle.

The company’s distinct engineering contribution is the Coaxmon, a three-dimensional qubit architecture developed by Dr. Peter Leek, who founded OQC in 2017 and serves as its chief scientific officer. Standard superconducting designs route control signals across the chip surface, generating crosstalk between qubits and wiring complexity that makes commercial data-center installation impractical. The Coaxmon routes those signals vertically through a layered on-chip structure, simplifying wiring enough to fit the full cryogenic assembly inside a standard rack-mounted enclosure. OQC’s chip design is in its third iteration; a fourth, carrying 16 logical qubits, is in development.

From Lab to Live Infrastructure

In September 2025, OQC installed its GENESIS quantum processor at Digital Realty’s JFK10 facility in New York alongside NVIDIA GH200 Grace Hopper Superchips, a deployment the company describes as the world’s first Quantum-AI Data Centre. Enterprise and government customers access the quantum compute without routing data outside a trusted network perimeter or managing cryogenic systems themselves. OQC describes itself as Europe’s first Quantum-Compute-as-a-Service (QCaaS) provider and the only organization to have deployed quantum hardware directly into commercial data centers at commercial scale. Active sites span the UK, US, Japan, and Spain.

Key technical figures from OQC’s published benchmarks:

• 99.8% two-qubit gate fidelity achieved in 25 nanoseconds, among the fastest and most accurate results recorded for any superconducting quantum system
• Rack-mountable cryogenic enclosures fitting standard multi-tenant data center racks, removing the isolated laboratory setups most competing platforms require
• One-to-one physical-to-logical qubit ratio, compared to tens or hundreds of physical qubits per logical qubit in leading alternative approaches
• Hybrid quantum-AI integration at Digital Realty JFK10, pairing OQC’s GENESIS processor with NVIDIA GH200 Grace Hopper Superchips

OQC’s Hardware Roadmap to 2034

TITAN, Targeted for 2028

The Series C specifically funds OQC TITAN, which the company describes as the first quantum system designed for commercial advantage. TITAN targets 2028, runs on a 100mm processor wafer with 2,000 lattice sites, and carries 200 logical qubits operating at a 1 MHz quantum operation clock speed, a rate OQC calls the QuOp rate. At a projected error rate of 10^-6, the company says the 2028 system will outperform classical computers on high-speed fraud detection, statistical arbitrage modeling, and cybersecurity vulnerability analysis.

The enabling architectural claim is a one-to-one physical-to-logical qubit ratio. Competing platforms require tens to hundreds of physical qubits to produce each error-corrected logical qubit, inflating hardware scale, cooling requirements, and cost. “We have a one-to-one resource ratio where each logical qubit occupies the same space as each physical one. This dramatically reduces overhead and creates a clear path to commercially viable quantum computing,” said Gerald Mullally, OQC’s chief executive, at The Economist’s Commercializing Quantum Global conference in May 2025.

The Roadmap Beyond 2028

OQC published a decade-long hardware development plan in June 2025, covering three generations through 2034, detailed on OQC’s technical roadmap. The company says its 2034 target of 50,000 logical qubits exceeds the highest published competitor roadmap by more than ten times.

At 50,000 logical qubits, a machine of the 2034 specification could theoretically run Shor’s algorithm against RSA-2048 encryption, the public-key standard securing most of the world’s digital communications today.

London Tech Week’s Biggest Deep-Tech Moment

Chancellor of the Exchequer Rachel Reeves welcomed the round publicly on June 3, describing it as “a major vote of confidence in the UK’s quantum sector.” The UK government has committed up to £2 billion under its National Quantum Strategy to help British quantum companies reach commercial scale. OQC arrived at London Tech Week as Europe’s first QCaaS provider, with live quantum hardware in four countries and an oversubscribed private round requiring no government equity to close.

This is a coming-of-age moment for British quantum computing. It shows that British companies can play a leading role in a technology that will shape all our futures.

Mullally made those remarks at the June 3 Series C announcement, describing a shift in the market from long-term research investment to near-term delivery. Jack Boyer, OQC’s chair, said the investor group’s composition, spanning dedicated quantum funds, university endowments, corporate strategics, and mainstream asset managers, signals institutional confidence in OQC’s ability to execute at scale.

The British Business Bank participated as a development finance institution within the round. The National Quantum Strategy is a separate government facility available to the UK quantum sector broadly; OQC raised no direct government equity in this Series C.

How the £260 Million Stacks Up Globally

PsiQuantum, the California-based photonics quantum company, raised $750 million in March 2025, combining BlackRock private capital with approximately $620 million AUD in Australian government equity and grants, then added a $1 billion Series E by September 2025, the largest single private quantum funding event globally. OQC’s Series C at $350 million is entirely private capital, with no government equity inside the allocation.

Crunchbase’s 2026 quantum computing investment tracker put global private seed-through-growth-stage funding in the sector at $1.2 billion through mid-May 2026, before OQC’s round closed. The full 2025 total was $4.1 billion. OQC’s single round is more than a quarter of what the entire sector raised globally in the five months before it.

• $490 million – approximate total across OQC’s three disclosed private rounds: $40.5 million Series A in 2022, $100 million Series B in 2024, $350 million Series C in June 2026
• $4.1 billion – global private quantum sector investment in full-year 2025, per Crunchbase
• $1.2 billion – global quantum sector private investment through mid-May 2026, per Crunchbase, before OQC’s round

The fourth-generation chip, with 16 logical qubits, is in development now; the 200-qubit system follows in 2028, funded.