Quantinuum's Helios: a 98-qubit trapped-ion processor with all-to-all connectivity and 99.921% two-qubit gate fidelity
Quantinuum announced its Helios trapped-ion quantum computer commercially in early November 2025 (press ~2025-11-05), with the technical characterization posted to arXiv on 2025-11-07. An arXiv preprint (2511.05465, submitted 2025-11-07; ~185 authors led by Anthony Ransford and David Hayes at Quantinuum) characterizes Helios, Quantinuum's named next-generation trapped-ion quantum computer. Helios uses 98 barium-137 hyperfine qubits in a rotatable ion-storage-ring architecture providing all-to-all connectivity, and reports a two-qubit gate infidelity of 7.9(2)x10^-4 (99.921% fidelity), single-qubit gate infidelity 2.5(1)x10^-5 (99.9975%), and state-preparation-and-measurement infidelity 4.8(6)x10^-4 (99.95%). Note: Quantinuum was a private company in November 2025; its Nasdaq IPO (ticker QNT) followed on 2026-06-04, so Helios surfaced via press and the arXiv paper, not SEC filings.
A named, fully-characterized commercial trapped-ion processor with 98 all-to-all-connected qubits and a published 99.921% two-qubit gate fidelity is a top-band industry milestone (section 8: named-processor launch with a published two-qubit fidelity record). It is Quantinuum's H-series successor, arriving the same month as the company's Nasdaq IPO, and the all-to-all connectivity plus high two-qubit fidelity directly reduce the overhead for error correction relative to nearest-neighbour architectures.
High-fidelity all-to-all 98-qubit operation positions Quantinuum's trapped-ion stack as the fidelity-and-connectivity leader against larger but lower-fidelity superconducting and neutral-atom systems; the open question is the throughput/clock-speed cost of the ion-shuttling architecture as qubit count scales further, and how quickly the fidelity translates into demonstrated logical-qubit advantage.