Full-Time

Quantum Engineer

QPU Design

Oxford Quantum Circuits

Oxford Quantum Circuits

51-200 employees

QCaaS provider with superconducting qubits

No salary listed

Reading, UK

Hybrid

Occasional domestic and international travel may be required.

PhD

Category
Hardware Engineering (1)
Required Skills
Python
Data Analysis

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Requirements
  • A PhD or equivalent multi-year commercial or research and development experience involving the measurement, design, or operation of quantum systems.
  • Experience designing superconducting quantum processors, including circuit layout and electromagnetic simulation using tools such as HFSS, Sonnet, COMSOL, or equivalent.
  • Strong knowledge of microwave engineering and superconducting circuit theory.
  • Experience in at least one relevant quantum or superconducting-device field, such as superconducting qubits, trapped ions, photonics, neutral atoms, solid-state spin systems, superconducting resonators, SQUIDs, microwave kinetic-inductance detectors, nano-electromechanical resonators, or surface-acoustic-wave devices.
  • Strong Python skills or experience with a comparable language for automation, scientific analysis, and data processing.
  • Ability to distil complex scientific information and communicate findings clearly to technical stakeholders.
  • Strong planning and organisational skills, with the ability to take ownership of research activities and deliver detailed, accurate work.
  • A creative, curious, and adaptable approach to solving complex scientific and engineering problems.
Responsibilities
  • Design and simulate novel superconducting quantum processors, optimising architectures, circuit layouts, and device performance.
  • Develop QPU designs that support low-error quantum gates, fast high-fidelity readout, and increasingly scalable processor architectures.
  • Build and improve advanced design methodologies for superconducting circuits using electromagnetic and circuit-level simulation.
  • Maintain OQC’s QPU design and simulation codebase through collaborative development, pull requests, and code reviews.
  • Analyse design and experimental data to identify processor limitations and translate findings into clear technical recommendations.
  • Own scientific research projects from experimental or simulation design through analysis, documentation, and reporting.
  • Contribute to the QSER roadmap, share technical knowledge across the team, and represent OQC through conferences, collaborations, and scientific publications.
Desired Qualifications
  • Advanced electromagnetic-simulation experience applied specifically to superconducting qubit design.
  • Experience with qubit parameter-extraction methods such as black-box quantisation, energy-participation-ratio analysis, or circuit analysis.
  • Knowledge of numerical or computational optimisation methods applied to QPU design.
  • Experience comparing experimental measurements with Hamiltonian models, circuit simulations, or electromagnetic simulations.
  • Experience developing or improving scientific design and simulation software.
  • A track record of publishing scientific research or presenting technical results, particularly within superconducting circuits or quantum processor design.
  • Experience supporting or mentoring junior researchers and sharing technical knowledge across multidisciplinary teams.
Oxford Quantum Circuits

Oxford Quantum Circuits

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Oxford Quantum Circuits provides Quantum Computing as a Service (QCaaS) using superconducting qubits built on its Coaxmon architecture. Clients access quantum hardware through direct access, managed services, cloud platforms, or colocated data centers, enabling hosted computations and managed workflows without building their own systems. The company differentiates itself with its Coaxmon qubit design, enterprise focus, and its status as the UK’s first QCaaS platform, backed by significant funding and global expansion. Its goal is to broaden enterprise access to quantum computing to tackle complex problems in areas like climate modeling and AI, and to scale a global quantum hardware and services ecosystem.

Company Size

51-200

Company Stage

Series C

Total Funding

$503.8M

Headquarters

Reading, United Kingdom

Founded

2017

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Simplify Jobs

Simplify's Take

What believers are saying

  • Barcelona’s €92 million hub starts in Q4 2026 and adds 210 jobs.
  • OQC says the Series C funds international expansion and deployed quantum infrastructure.
  • OQC’s enterprise pipeline deepened with JPMorganChase as London’s first dedicated user.

What critics are saying

  • OQC’s best system is 32 qubits; commercialization demands far larger fault-tolerant machines.
  • TITAN targets 200 logical qubits by 2028, leaving a fragile three-year execution window.
  • If enterprise revenue lags hardware burn, OQC faces dilution, layoffs, or shutdown.

What makes Oxford Quantum Circuits unique

  • OQC’s Coaxmon superconducting architecture powers QCaaS across London, Tokyo, New York, and Spain.
  • JPMorganChase and AMD chose OQC for London’s secure quantum-AI data center in June 2026.
  • Bullhound Capital led OQC’s £260 million Series C, Europe’s largest private quantum round.

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Benefits

Health Insurance

Disability Insurance

Parental Leave

Growth & Insights and Company News

Headcount

6 month growth

-1%

1 year growth

-1%

2 year growth

1%
Quantum Zeitgeist
Aug 21st, 2026
OQC raises $330M as quantum computing shifts from research to critical infrastructure

Quantum computing firm OQC has completed a £260 million Series C funding round, positioning itself as one of the best-capitalised private quantum computing companies globally. Chief executive Gerald Mullally said the capital will enable OQC to expand internationally and build secure, scalable quantum infrastructure for enterprise and government customers. Mullally noted that recent public market activity, including Quantinuum's initial public offering, is helping build investor confidence in the sector. He described the developments as signalling a shift for quantum computing beyond research towards practical infrastructure. The funding will support OQC's technology roadmap, advancing its quantum processors and software platforms. Mullally indicated the company's strategy includes shaping the industry's next phase through technological innovation and strategic partnerships.

VIPress
Jun 24th, 2026
UK's OQC raises record $330M for quantum computing expansion

Oxford Quantum Circuits (OQC), a British quantum computing startup, has raised £260 million (approximately €300 million) in a Series C round, marking Europe's largest private funding for a quantum computing company. The oversubscribed round was led by Bullhound Capital. Founded in the UK, OQC develops superconductor-based quantum computers for data centres serving enterprises and public administrations. The company has already deployed systems across Europe, North America and Asia, including installations in the UK, US, Japan and Spain. The funding will accelerate international expansion and development of fault-tolerant quantum computing technologies. OQC targets sectors including finance, defence and security, which require advanced computing capabilities for data processing, complex optimisation and enhanced analysis. CEO Gerald Mullally said the market is shifting from technological promises towards concrete deployments addressing real needs.

UK Tech News
Jun 4th, 2026
JPMorganChase, OQC and AMD to build $330M quantum AI platform in London

Oxford Quantum Circuits (OQC), JPMorganChase and AMD have announced a research collaboration centred on a new quantum AI data centre in London. JPMorganChase researchers will test quantum and hybrid quantum-classical computing applications in a secure enterprise environment to address complex financial services challenges. The collaboration aims to investigate how quantum-enhanced AI models can accelerate algorithm discovery for financial use cases. JPMorganChase will be the UK platform's first dedicated user, with full operations expected within 12 months. The platform integrates quantum hardware within a secure enterprise compute environment, enabling JPMorganChase to test hybrid workflows against financial services operational standards. This week, OQC closed an oversubscribed £260 million Series C funding round, Europe's largest private funding round for a quantum computing company.

Sifted
Jun 3rd, 2026
Oxford Quantum Circuits bags $348M ($350M) Series C, Europe's largest private quantum computing round

Oxford Quantum Circuits has raised £260m ($350m) in a Series C round, marking the largest funding for a private quantum computing company in Europe. The round was led by Bullhound Capital, with participation from British Business Bank, European investors including Fynveur and Cofides, and US and Singapore-based firms. The UK-based scaleup builds quantum computers using superconducting qubits and offers them as a service through partner data centres in London, Tokyo and New York. Customers buy computing time rather than purchasing systems outright, an approach particularly attractive to regulated sectors like finance and defence requiring secure data storage. The funding will support geographic expansion and development of next-generation systems. OQC's current most advanced computer has 32 qubits, with CEO Gerald Mullally stating the goal is building systems for the "commercial era of quantum".

Quantum Computing Report
Jun 3rd, 2026
Oxford Quantum Circuits Closes £260 Million ($350 Million USD) Series C Round to Scale Superconducting Quantum Infrastructure Globally - Quantum Computing Report

UK-headquartered hardware developer Oxford Quantum Circuits has finalized an oversubscribed £260 million ($350 million) Series C funding round, representing the largest private capital raise for a quantum computing entity in European history. Led by Bullhound Capital, the financing loop includes public and private institutional tranches from the British Business Bank (contributing a £100 million anchor commitment), Fynveur (advised by Invus), COFIDES, Mastercard, IHAG, 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, and Oxford Capital. Existing investors, including Oxford Science Enterprises, SBI, Chevron Technology [...]