Catalog — QPU record · Quantinuum · Trapped ion

Quantinuum Helios (Helios-1)

Name: Quantinuum Helios (Helios-1) specifications
Creator: QPU137

Quantinuum Helios (Helios-1) is a trapped ion gate-based processor by Quantinuum with 98 qubits (2025). Below: every publicly disclosed figure with its source, method, and vendor-claim status — plus what is not disclosed, recorded as findings.

Data as of 2026-08-19Compile a circuit for this class of device Compare

Measurement records9 disclosed · 2 not disclosed · 4 sources

Select a figure to open its record

Qubit count (qubit_count_physical)98 qubitsvendor claim

Vendor claim

Source: Quantinuum Helios Product Data Sheet, Version 1.2 · published 2026-06-09
Method: VENDOR_UNSPECIFIED
Notes: 'N >= 98 137Ba+ qubit trapped-ion based quantum computers'; Table 1: Qubits = 98; two-qubit quantum logic zones = 4. Commercially launched 2025-11-05.
Citation key: [quantinuum/quantinuum-helios:qubit-count-physical:2026-08-19]

Two-qubit gate quality (two_qubit_gate_infidelity_spec)8e-4 (Typical), 20e-4 (Max) infidelityvendor claim

Vendor claim

Source: Quantinuum Helios Product Data Sheet, Version 1.2 · published 2026-06-09
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: Launch announcement states '99.921% two-qubit gate fidelity across all qubit pairs' (blog, 2025-11-05); performance validation page lists Helios-1 measured 2Q RB infidelity 7.9e-4.
Citation key: [quantinuum/quantinuum-helios:two-qubit-gate-infidelit:2026-08-19]

Two-qubit gate quality (two_qubit_gate_infidelity_paper)7.9(2)e-4 infidelityvendor claim

Vendor claim

Source: Helios: A 98-qubit trapped-ion quantum computer (arXiv:2511.05465, submitted 2025-11-07; published as 'A 98-qubit trapped-ion quantum computer with all-to-all connectivity', Nature, 2026) · published 2025-11-07
Method: Benchmarked via random Clifford circuits and random circuit sampling (paper abstract); performance validation page: two-qubit randomized benchmarking with random Clifford gates
Aggregation: average
Notes: Quantinuum-authored; press coverage (The Quantum Insider, 2026-06-18) states Sandia National Laboratories evaluated and certified Helios performance in the Nature paper — not independently verified here (Nature page is paywalled).
Citation key: [quantinuum/quantinuum-helios:two-qubit-gate-infidelit:2026-08-19]

Single-qubit gate quality (one_qubit_gate_infidelity)0.3e-4 (Typical), 2e-4 (Max); paper: 2.5(1)e-5 average infidelityvendor claim

Vendor claim

Source: Quantinuum Helios Product Data Sheet, Version 1.2; arXiv:2511.05465 · published 2026-06-09
Method: Random Clifford circuits / 1-qubit randomized benchmarking
Aggregation: Typical = average over all operational zones (data sheet); average (paper)
Notes: Launch blog claims '99.9975% single-qubit gate fidelity' (2025-11-05), consistent with 2.5e-5 infidelity.
Citation key: [quantinuum/quantinuum-helios:one-qubit-gate-infidelit:2026-08-19]

Spam error (spam_error)5e-4 (Typical), 20e-4 (Max); paper: 4.8(6)e-4 average; performance validation: 4.8e-4 (combined) error probabilityvendor claim

Vendor claim

Source: Quantinuum Helios Product Data Sheet, Version 1.2; arXiv:2511.05465; Performance Validation page · published 2026-06-09
Method: State preparation and measurement (SPAM) error
Aggregation: Typical/Max (data sheet); average (paper)
Notes: Combined SPAM published rather than separate readout fidelity.
Citation key: [quantinuum/quantinuum-helios:spam-error:2026-08-19]

Memory error (memory_error)6e-4 (Typical), 10e-4 (Max) error per qubit at average depth-1 circuitvendor claim

Vendor claim

Source: Quantinuum Helios Product Data Sheet, Version 1.2 · published 2026-06-09
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: 0.5e-4 (Typical), 7e-4 (Max) — footnoted as 'a global representation across the Helios trap'.
Citation key: [quantinuum/quantinuum-helios:memory-error:2026-08-19]

Coherence (T2_coherence)'Long T2 coherence times (~seconds)' — qualitative only seconds (order of magnitude)vendor claim

Vendor claim

Source: Quantinuum Helios Product Data Sheet, Version 1.2 · published 2026-06-09
Method: Stated as a feature bullet in the data sheet; 137Ba+ hyperfine clock-transition qubit
Notes: No numeric measured T1/T2 in the data sheet.
Citation key: [quantinuum/quantinuum-helios: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: Helios Product Data Sheet v1.2 (all 4 pages), Helios product page, launch blog, arXiv:2511.05465 abstract

Quantum volume (quantum_volume)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: Helios Product Data Sheet v1.2, Helios product page, launch blog 'Introducing Helios', web search for 'Quantinuum Helios quantum volume'
Notes: Some aggregator articles attribute the 33.5M (2^25) QV record to Helios, but Quantinuum's own H2 product page attributes 2^25 to System Model H2; no vendor-published Helios QV found.

Logical qubit claims (logical_qubit_claims)94 logical qubits fully entangled (error-detected); 48 fully error-corrected logical qubits at 2:1 encoding rate logical qubitsvendor claim

Vendor claim

Source: Introducing Helios: The Most Accurate Quantum Computer in the World · published 2025-11-05
Method: VENDOR_UNSPECIFIED
Citation key: [quantinuum/quantinuum-helios:logical-qubit-claims:2026-08-19]

Pricing model (cloud_access_and_pricing_model)Available through Quantinuum's cloud service and on-premises offering (commercial launch 2025-11-05); not listed as an Azure Quantum target as of the provider page (updated 2026-05)vendor claim

Vendor claim

Source: Helios | Quantinuum's Quantum Computers (product page); Azure Quantum provider page lists only H2-1/H2-2 targets
Method: VENDOR_UNSPECIFIED
Notes: Commercial paid access exists (cloud subscription + on-prem sales); exact pricing not published on the pages checked. Nexus is the vendor's access/management platform per launch blog.
Citation key: [quantinuum/quantinuum-helios:cloud-access-and-pricing:2026-08-19]

Topology

all-to-all — QCCD architecture with eight gate zones in a trap consisting of a single circular storage ring and two linear gating sections; eight gate zones for SPAM and 1-qubit operations, four gate zones for 2-qubit operations; junction transport and random qubit access give all-to-all connectivity across 98 ions.

SOURCE: Quantinuum Helios Product Data Sheet, Version 1.2

Native gate set

1q 1-qubit rotations
2q 2-qubit ZZ gates · parameterized-angle ZZ gates

SOURCE: Quantinuum Helios Product Data Sheet, Version 1.2 ('Native gate set: 1-qubit rotations, 2-qubit ZZ gates, parameterized-angle ZZ gates')

Cloud access

Quantinuum cloud service (Nexus platform)
On-premises deployment offering (incl. NVIDIA GB200 integration option)

Corrections

Found an error in this data? Report it — every report is logged publicly, whether or not it turns out to be right.

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.