Quantinuum Helios: 48 Logical Qubits at ~2:1 Base-to-Logical Overhead

Quantinuum commercially launched Helios, achieving 48 error-corrected LQ (≤2:1 overhead), 50 LQ error-detected, and 94 LQ globally entangled — all with better-than-base performance. Key fidelities: 2Q gate 99.921%, 1Q gate 99.9975%, logical SPAM 99.99%.

In November 2025, Quantinuum commercially launched Helios, its next-generation trapped-ion quantum computer — the world's most accurate general-purpose commercial quantum system. Helios achieves:

48 LQ (error-corrected): logical SPAM fidelity >99.99%, better than base performance
50 LQ (error-detected): demonstrated with better-than-base performance in a magnetism simulation
94 LQ (error-detected, globally entangled): better-than-base performance

The 48 error-corrected LQ are encoded from approximately 98 qubits — a ~2:1 resource-to-logical overhead, down from H2's 4.7:1 (12 LQ from 56 qubits). Key hardware fidelities: 2Q gate 99.921%, 1Q gate 99.9975%.

Helios introduces the first commercial use of an ion junction, enabling volume-to-volume ion transfer. The system is now available to customers including Amgen, BMW Group, JPMorganChase, and SoftBank Corp. Quantinuum's roadmap continues: Sol (2027, ~200 LQ) and Apollo (2029, ~400 LQ).