Oxford Ionics

Oxford Ionics was a UK trapped-ion Quantum computing company spun out of the University of Oxford physics department in 2019 by Dr Chris Ballance and Dr Tom Harty, both experts in trapped-ion technologies who met during their PhDs at Oxford. The company's core innovation was Electronic Qubit Control: using standard semiconductor chip fabrication rather than lasers to trap and manipulate qubits, aiming to scale Quantum computing without the precision-optics complexity that limits competing approaches. Its total pre-acquisition funding was approximately $48.4m across two rounds, with investors including Oxford Science Enterprises, Lansdowne Partners, Prosus Ventures, and Hermann Hauser.

Before its acquisition, Oxford Ionics won a £6m contract from the National Quantum Computing Centre (NQCC) at Harwell to supply a full-stack system. The resulting machine, called QUARTET, was delivered and installed at the NQCC's Harwell data centre in August 2025. QUARTET held world records for two-qubit gate Fidelity and single-qubit gate Fidelity at the time of delivery. In June 2025, US quantum company IonQ announced it would acquire Oxford Ionics; the transaction closed on 17 September 2025 at a valuation of $1.075bn, making it the largest Quantum computing spinout acquisition from the University of Oxford to date.

Oxford Ionics is cited by Lansdowne Partners as a prior portfolio success alongside Oxford Nanopore, Raspberry Pi and Helsing. Its exit validates the university-spinout-to-global-acquisition pathway that Lansdowne's new fund aims to systematise. Ballance and Harty remain with IonQ post-acquisition, continuing development in Oxford.