Quantum Hardware Database
Quantinuum H2
Quantinuum's H2 processor (formed from the 2021 merger of Honeywell Quantum Solutions and Cambridge Quantum) has repeatedly set records for two-qubit gate fidelity, using a quantum charge-coupled device architecture that physically shuttles ions between trap zones to achieve flexible, high-quality connectivity.
Qubit Count
56
Qubit Type
Trapped-ion (ytterbium ions)
Architecture
Quantum charge-coupled device (QCCD) linear trap
Released
2023
Gate Error (2Q)
~0.03% per two-qubit gate — among the best published fidelities of any platform
Coherence Time
T₂ in the seconds range
Operating Temp
Room temperature (ion trap operates in vacuum)
Cloud Access
Yes — Microsoft Azure Quantum, Quantinuum direct access
Company
Quantinuum
Connectivity
All-to-all via ion shuttling between trap zones
Key Features
- Among the highest published two-qubit gate fidelities of any quantum hardware platform
- QCCD architecture allows ions to be physically moved for flexible qubit connectivity
- Used to demonstrate some of the most complex error-corrected logical qubit experiments to date
- Strong focus on quantum chemistry and cryptography research applications
Limitations
- Lower qubit count than leading superconducting processors
- Ion shuttling adds operational complexity and time overhead compared to fixed-position qubit architectures
Technical Notes
The QCCD architecture's defining feature is the ability to physically move ions between different zones of the trap, effectively reconfiguring which qubits are adjacent to each other on demand — a fundamentally different approach to achieving connectivity than either superconducting grids or static ion chains.