Catalog — QPU record · Quantinuum · Trapped ion
Quantinuum System Model H1 (H1-1)
Quantinuum System Model H1 (H1-1) is a trapped ion gate-based processor by Quantinuum with 20 qubits (2020). Below: every publicly disclosed figure with its source, method, and vendor-claim status — plus what is not disclosed, recorded as findings.
Measurement records10 disclosed · 2 not disclosed · 5 sources
Select a figure to open its record
Qubit count (qubit_count_physical)20 qubitsvendor claim
Vendor claim
- Source
- Quantinuum System Model H1 Product Data Sheet, Version 8.0.1 · published 2025-06-09
- Method
- VENDOR_UNSPECIFIED
- Notes
- Launched Oct 2020 with 10 qubits, upgraded to 20 fully connected qubits. Data sheet Table 1: Qubits = 20; five parallel two-qubit operations.
- Citation key
[quantinuum/quantinuum-system-model-h1:qubit-count-physical:2026-08-19]
Two-qubit gate quality (two_qubit_gate_infidelity_spec)1e-3 (Typical), 3e-3 (Max) infidelityvendor claim
Vendor claim
- Source
- Quantinuum System Model H1 Product Data Sheet, Version 8.0.1 · published 2025-06-09
- Method
- Not stated in data sheet table (machine-specific data referenced to Performance Validation document and hardware specifications GitHub repository)
- Aggregation
- Typical = most representative infidelity during machine operation, averaged over all operational zones; Max = upper bound during operation
- Notes
- Equivalent to typical 2Q gate fidelity 99.9%.
- Citation key
[quantinuum/quantinuum-system-model-h1:two-qubit-gate-infidelit:2026-08-19]
Two-qubit gate quality (two_qubit_gate_infidelity_measured)9.7e-4 (+/- 6.2e-5) infidelityvendor claim
Vendor claim
- Method
- Two-qubit randomized benchmarking with random Clifford gates on qubit pairs
- Aggregation
- average (system-level measurement reported on vendor performance page)
- Notes
- Vendor-published characterization data; underlying raw data published in the Quantinuum hardware-specifications GitHub repository (github.com/CQCL/quantinuum-hardware-specifications).
- Citation key
[quantinuum/quantinuum-system-model-h1:two-qubit-gate-infidelit:2026-08-19]
Two-qubit gate quality (two_qubit_gate_fidelity_milestone)99.914(3)% fidelityvendor claim
Vendor claim
- Source
- Quantinuum extends its significant lead in quantum computing, achieving historic milestones for hardware fidelity and Quantum Volume · published 2024-04-16
- Method
- randomized benchmarking, on the commercially available device
- Aggregation
- across all qubit pairs
- Notes
- The 'three 9s' milestone announcement for H1-1.
- Citation key
[quantinuum/quantinuum-system-model-h1:two-qubit-gate-fidelity-:2026-08-19]
Single-qubit gate quality (one_qubit_gate_infidelity)2e-5 (Typical), 2e-4 (Max); measured 1.8e-5 (+/- 2.9e-6) infidelityvendor claim
Vendor claim
- Source
- Quantinuum System Model H1 Product Data Sheet, Version 8.0.1 (spec); Performance Validation page (measured) · published 2025-06-09
- Method
- One-qubit randomized benchmarking with Clifford gates (performance validation page)
- Aggregation
- Typical = average over all operational zones (data sheet); measured value from performance validation page
- Citation key
[quantinuum/quantinuum-system-model-h1:one-qubit-gate-infidelit:2026-08-19]
Spam error (spam_error)2e-3 (Typical), 5e-3 (Max); measured 1.22e-3 (|0>) / 3.43e-3 (|1>) error probabilityvendor claim
Vendor claim
- Source
- Quantinuum System Model H1 Product Data Sheet, Version 8.0.1; Performance Validation page · published 2025-06-09
- Method
- State preparation and measurement (SPAM) error
- Aggregation
- Typical average over operational zones (data sheet); per-state averages (performance validation)
- Notes
- Quantinuum publishes SPAM (combined state-prep + readout) rather than a separate readout fidelity.
- Citation key
[quantinuum/quantinuum-system-model-h1:spam-error:2026-08-19]
Memory error (memory_error)2e-4 (Typical), 1e-3 (Max) error per qubit at average depth-1 circuitvendor claim
Vendor claim
- Source
- Quantinuum System Model H1 Product Data Sheet, Version 8.0.1 · published 2025-06-09
- Method
- Memory error per qubit at average depth-1 circuit
- Aggregation
- Typical / Max as defined in data sheet
- Notes
- Also mid-circuit measurement cross-talk error: 4e-5 (Typical), 2e-4 (Max).
- Citation key
[quantinuum/quantinuum-system-model-h1:memory-error:2026-08-19]
Coherence (T1_T2_coherence)not publicly disclosed
Not publicly disclosed — checked 2026-08-19
- Finding
- No public disclosure found. This is a recorded, dated finding — we do not substitute an estimate or borrow a figure from a sibling device.
- Sources queried
- H1 Product Data Sheet v8.0.1 (full 3 pages), Performance Validation page on docs.quantinuum.com, web search for Quantinuum H1 coherence times
- Notes
- Quantinuum specifies memory error per qubit at average depth-1 circuit instead of T1/T2 for H1.
Gate duration (two_qubit_gate_duration)not publicly disclosed
Not publicly disclosed — checked 2026-08-19
- Finding
- No public disclosure found. This is a recorded, dated finding — we do not substitute an estimate or borrow a figure from a sibling device.
- Sources queried
- H1 Product Data Sheet v8.0.1, Performance Validation page, Azure Quantum Quantinuum provider page
- Notes
- In QCCD machines wall-clock time is dominated by ion transport; no per-gate duration published in the data sheet.
Quantum volume (quantum_volume)1,048,576 (2^20) quantum volumevendor claim
Vendor claim
- Source
- Quantinuum extends its significant lead in quantum computing, achieving historic milestones for hardware fidelity and Quantum Volume · published 2024-04-16
- Method
- IBM Quantum Volume protocol (as run by Quantinuum; data in vendor GitHub repositories)
- Notes
- At launch (October 2020) H1 had a measured quantum volume of 128 with 10 qubits (Honeywell press release, honeywell.com, Oct 2020).
- Citation key
[quantinuum/quantinuum-system-model-h1:quantum-volume:2026-08-19]
Availability (availability_status)Retired from commercial service on October 15, 2025vendor claim
Vendor claim
- Source
- Quantinuum Systems Product Change Notification: System Model H1 (H1-1) Retirement (Issue Date July 15, 2025) · published 2025-07-15
- Method
- VENDOR_UNSPECIFIED
- Notes
- PCN: 'the H1-1 QPU, emulator, and syntax checker will be retired from commercial service on October 15th, 2025'; H1 PAYG plan removed from Azure Quantum; reason: 'With the 2025 release of the Helios quantum computer we have made the decision to sunset H1-1'. PDF served from https://docs.quantinuum.com/systems/_static/assets/pcns/... path.
- Citation key
[quantinuum/quantinuum-system-model-h1:availability-status:2026-08-19]
Pricing model (pricing_model_exists)Yes - HQC (Hardware Quantum Credit) usage credits via monthly subscription and PAYG plans (Quantinuum direct and Azure Quantum)vendor claim
Vendor claim
- Source
- Quantinuum provider - Azure Quantum | Microsoft Learn · published 2025-01-28
- Method
- VENDOR_UNSPECIFIED
- Notes
- HQC formula published: HQC = 5 + C(N1q + 10*N2q + 5*Nm)/5000. H1 PAYG plan existed on Azure until retirement (per retirement PCN).
- Citation key
[quantinuum/quantinuum-system-model-h1:pricing-model-exists:2026-08-19]
QPU137 is independent and is not affiliated with, endorsed by, or sponsored by Quantinuum. Figures above are public disclosures recorded with their sources on 2026-08-19; vendor claims are labeled as such and may not be directly comparable across measurement methods — see methodology.