Quantinuum H-Series (H2 + Helios)

Quantinuum's H-Series sets the gold standard in fidelity, with the System Model H2 featuring 56 physical qubits, all-to-all connectivity, and 99.8% two-qubit gate fidelities — a different architecture from superconducting chips like Google's Willow, trading raw qubit count for connectivity and low error rates. H2 holds the industry record for highest quantum volume and CLOPS benchmarks, and the Microsoft partnership demonstrated reliable logical qubits with below-threshold error rates. RIKEN procured a full H2 in April 2026, while Helios upgrades to about 100 qubits with errors below 5×10⁻⁴. Quantinuum targets universal fault-tolerant computing by 2030, with enterprise partners like AstraZeneca, Merck, and JPMorgan Chase using the InQuanto platform and TKET compiler for hybrid workflows.