TL;DR: Quantinuum's H2 holds the record for highest gate fidelities and Quantum Volume of any quantum computer. In 2025, H2 achieved a Quantum Volume of 2²³ = 8,388,608, the highest ever recorded. Trapped io
Quantinuum's H2 holds the record for highest gate fidelities and Quantum Volume of any quantum computer. In 2025, H2 achieved a Quantum Volume of 2²³ = 8,388,608, the highest ever recorded. Trapped ions offer all-to-all connectivity (any qubit can directly interact with any other), eliminating the need for SWAP gates. The H2 has demonstrated 20+ logical qubits with error correction. Quantinuum is building the Helios system with 96 qubits.
Qubits
32 (trapped ions); all-to-all connectivity
Technology
Trapped ion (ytterbium-171)
Gate Fidelity
99.8% 2-qubit gate; 99.99% single-qubit
Status
Operational (2023); highest-fidelity quantum computer; Quantum Volume 2²³ = 8,388,608 (2025 world record)
Frequently Asked Questions
What is Quantinuum H2?
Quantinuum's H2 holds the record for highest gate fidelities and Quantum Volume of any quantum computer. In 2025, H2 achieved a Quantum Volume of 2²³ = 8,388,608, the highest ever recorded. Trapped ions offer all-to-all connectivity (any qubit can directly interact with any other), eliminating the n
Who makes Quantinuum H2?
Quantinuum H2 is made by Quantinuum.