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Quantinuum System Model H2 (H2-1 / H2-2)
Quantinuum System Model H2 (H2-1 / H2-2) is a trapped ion gate-based processor by Quantinuum with 56 qubits (2023). Below: every publicly disclosed figure with its source, method, and vendor-claim status — plus what is not disclosed, recorded as findings.
Measurement records10 disclosed · 1 not disclosed · 6 sources
Select a figure to open its record
Qubit count (qubit_count_physical)56 qubitsvendor claim
Vendor claim
- Source
- Quantinuum System Model H2 Product Data Sheet, Version 4.00 · published 2025-09-17
- Method
- VENDOR_UNSPECIFIED
- Notes
- Launched 2023-05-09 with 32 qubits; upgraded to 56 in 2024. Azure Quantum lists both H2-1 and H2-2 at 56 qubits. Table 1: parallel two-qubit operations = 4.
- Citation key
[quantinuum/quantinuum-system-model-h2:qubit-count-physical:2026-08-19]
Two-qubit gate quality (two_qubit_gate_infidelity_spec)1e-3 (Typical), 2e-3 (Max) infidelityvendor claim
Vendor claim
- Source
- Quantinuum System Model H2 Product Data Sheet, Version 4.00 · published 2025-09-17
- Method
- Not stated in data sheet table (references 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 fidelity 99.9%. Vendor product page markets '>99.9% two-qubit gate fidelity'.
- Citation key
[quantinuum/quantinuum-system-model-h2:two-qubit-gate-infidelit:2026-08-19]
Two-qubit gate quality (two_qubit_gate_infidelity_measured)H2-1: 1.1e-3 (+/- 8.1e-5); H2-2: 8.3e-4 (+/- 4.8e-5) infidelityvendor claim
Vendor claim
- Method
- Two-qubit randomized benchmarking with random Clifford gates on qubit pairs
- Aggregation
- average (per-machine values on vendor performance page)
- Notes
- Raw characterization data published at github.com/CQCL/quantinuum-hardware-specifications.
- Citation key
[quantinuum/quantinuum-system-model-h2:two-qubit-gate-infidelit:2026-08-19]
Two-qubit gate quality (two_qubit_gate_fidelity_peer_reviewed)launch config (32 qubits): average 2Q gate infidelity 1.84(5)e-3 (PRX 13, 041052); 56-qubit config: 99.843(5)% 2Q fidelity (PRX 15, 021052) infidelity / fidelityvendor claim
Vendor claim
- Source
- A Race-Track Trapped-Ion Quantum Processor (Phys. Rev. X 13, 041052 (2023)); and arXiv:2406.02501, The computational power of random quantum circuits in arbitrary geometries (Phys. Rev. X 15, 021052 (2025)) · published 2023-05-05
- Method
- randomized benchmarking (racetrack paper); RCS/XEB campaign paper for 56-qubit config
- Aggregation
- average (system-wide, randomized benchmarking)
- Notes
- Peer-reviewed (PRX) but authored by Quantinuum (S. A. Moses et al.), so still vendor-generated measurements.
- Citation key
[quantinuum/quantinuum-system-model-h2:two-qubit-gate-fidelity-:2026-08-19]
Single-qubit gate quality (one_qubit_gate_infidelity)3e-5 (Typical), 2e-4 (Max); measured H2-1: 1.9e-5 (+/- 4.2e-6), H2-2: 2.8e-5 (+/- 3.6e-6); paper: 2.5(3)e-5 average infidelityvendor claim
Vendor claim
- Source
- Quantinuum System Model H2 Product Data Sheet, Version 4.00; Performance Validation page; arXiv:2305.03828 · published 2025-09-17
- Method
- One-qubit randomized benchmarking with Clifford gates
- Aggregation
- Typical = average over all operational zones (data sheet); per-machine averages (performance validation); system average (PRX paper)
- Citation key
[quantinuum/quantinuum-system-model-h2:one-qubit-gate-infidelit:2026-08-19]
Spam error (spam_error)1e-3 (Typical), 5e-3 (Max); measured H2-1: 6.00e-4 (|0>) / 1.39e-3 (|1>), H2-2: 6.75e-4 (|0>) / 1.16e-3 (|1>); paper: 1.6(1)e-3 average error probabilityvendor claim
Vendor claim
- Source
- Quantinuum System Model H2 Product Data Sheet, Version 4.00; Performance Validation page; arXiv:2305.03828 · published 2025-09-17
- Method
- State preparation and measurement (SPAM) error
- Aggregation
- Typical/Max (data sheet); per-state per-machine (performance validation); average (PRX paper)
- Notes
- Combined SPAM published rather than separate readout fidelity.
- Citation key
[quantinuum/quantinuum-system-model-h2:spam-error:2026-08-19]
Memory error (memory_error)2e-4 (Typical), 2e-3 (Max) error per qubit at average depth-1 circuitvendor claim
Vendor claim
- Source
- Quantinuum System Model H2 Product Data Sheet, Version 4.00 · published 2025-09-17
- 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: 5e-6 (Typical), 2e-4 (Max). Racetrack paper reports transport 1Q RB infidelity 2.2(3)e-4 as memory-error proxy.
- Citation key
[quantinuum/quantinuum-system-model-h2:memory-error:2026-08-19]
Coherence (T1_T2_coherence)T1: 'several minutes' (qualitative); T2: no value publishedvendor claim
Vendor claim
- Source
- A Race-Track Trapped-Ion Quantum Processor (full text) · published 2023-05-05
- Method
- Stated qualitatively in the racetrack paper: 'Additional sources of memory error are the finite T1 time of several minutes, transport failures, or background gas collisions'
- Notes
- No numeric T1/T2 in the product data sheet; Quantinuum specifies memory error per depth-1 circuit instead.
- Citation key
[quantinuum/quantinuum-system-model-h2:t1-t2-coherence:2026-08-19]
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
- H2 Product Data Sheet v4.00, full text of arXiv:2305.03828 via ar5iv, Azure Quantum Quantinuum provider page, docs.quantinuum.com
- Notes
- Racetrack paper states transport (not gates) takes 60% of total circuit time on average, but does not publish a per-gate duration.
Quantum volume (quantum_volume)33,554,432 (2^25) current claim on product page; 8,388,608 (2^23) announced May 12, 2025; 65,536 (2^16) at May 2023 launch quantum volumevendor claim
Vendor claim
- Method
- IBM Quantum Volume protocol; QV benchmarking data published in vendor GitHub repositories
- Notes
- 32-qubit GHZ state fidelity 82.0(7)% at launch (launch blog).
- Citation key
[quantinuum/quantinuum-system-model-h2:quantum-volume:2026-08-19]
Pricing model (pricing_model_exists)Yes - HQC (Hardware Quantum Credit) usage credits; monthly subscription plans, H2 PAYG plan, and Academic PAYG planvendor claim
Vendor claim
- Source
- Quantinuum provider - Azure Quantum | Microsoft Learn · published 2025-01-28
- Method
- VENDOR_UNSPECIFIED
- Notes
- Published formula: HQC = 5 + C(N1q + 10*N2q + 5*Nm)/5000, where C = shot count. H2 PAYG and subscription plans also confirmed in the H1 retirement PCN (2025-07-15).
- Citation key
[quantinuum/quantinuum-system-model-h2: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.