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Oxford Ionics
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Oxford Ionics

British trapped-ion Quantum computing developer acquired by IonQ in September 2025.

Oxford Ionics develops quantum-computing hardware that combines trapped ions with silicon-chip technology. The Oxford spinout forms part of IonQ and retains a UK base.

Last refreshed: 22 October 2026

Timeline for Oxford Ionics

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Background

Oxford Ionics is a British quantum-computing developer founded by physicists Chris Ballance and Tom Harty, who met during their doctoral studies at Oxford. Its hardware combines trapped-ion qubits, the basic units of quantum information, with conventional silicon-chip technology. The approach addresses a central engineering problem: controlling larger numbers of qubits without making the control equipment impractically complex.

The company forms part of IonQ following the completed acquisition in September 2025. Its technology and engineering team contribute to IonQ’s quantum-computing programme, while its UK operations provide a base for work with universities, research institutions and public-sector partners. Oxford Ionics grew out of Oxford’s physics research and received early backing from Oxford Science Enterprises.

Common Questions
What did Oxford Ionics do before being acquired by IonQ?
Oxford Ionics developed trapped-ion quantum computers using standard semiconductor chip fabrication (Electronic Qubit Control) rather than lasers, spun out of Oxford University in 2019. It delivered the QUARTET full-stack system to the UK's National Quantum Computing Centre at Harwell in August 2025, holding world records for gate Fidelity. IonQ acquired it for $1.075bn in September 2025.Source: Oxford University Innovation / IonQ
Who founded Oxford Ionics?
Oxford Ionics was founded in 2019 by Dr Chris Ballance and Dr Tom Harty, two physicists who developed trapped-ion Quantum computing techniques during their PhDs at the University of Oxford.Source: University of Oxford Department of Physics
How much was Oxford Ionics sold for?
IonQ acquired Oxford Ionics for $1.075bn in a deal that closed on 17 September 2025, making it the largest Quantum computing spinout acquisition from the University of Oxford. The consideration consisted primarily of IonQ common stock plus approximately $10m in cash.Source: IonQ / Oxford Ionics
Why is Oxford Ionics significant for UK quantum computing?
Oxford Ionics proved the university-spinout-to-global-acquisition pathway for UK Quantum computing: founded in 2019, it delivered a world-record-Fidelity machine to the NQCC by 2025 and was acquired by IonQ for over $1bn. Lansdowne Partners cites it as a portfolio exit alongside Oxford Nanopore and Raspberry Pi to demonstrate its new spinout fund's thesis.Source: Lansdowne Partners / EU-Startups
Source Material
Oxford quantum computing spinout acquisitionIonQ completes acquisition of Oxford IonicsIonQ Announces Agreement to Acquire Oxford IonicsQuantum leap: Oxford's highest-value quantum computing spinout acquisition

Written with AI from Lowdown's published reporting. Not individually reviewed by an editor. Updated 22 October 2026. Editorial standards.