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Atom Computing second-generation system (1,225-site array)

Name: Atom Computing second-generation system (1,225-site array) specifications
Creator: QPU137

Atom Computing second-generation system (1,225-site array) is a neutral atom gate-based processor by Atom Computing with a disclosed qubit count detailed below (2023). 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 records5 disclosed · 3 not disclosed · 3 sources

Select a figure to open its record

Qubit count (physical qubit count)1,180 qubits on a 1,225-site atomic array qubits / sitesvendor claim

Vendor claim

Source: Quantum startup Atom Computing first to exceed 1,000 qubits (Atom Computing press release) · published 2023-10-24
Method: VENDOR_UNSPECIFIED
Notes: Naming caution: the assignment called this 'Phoenix', but Phoenix is Atom Computing's first-generation 100-qubit prototype; the 2025 vendor whitepaper states the '100-qubit prototype system is now superseded by their second-generation system hosting over 1,200 qubits' with a computing array 'as large as 1,225 sites'. PR quote: 'first time a company has crossed the 1,000-qubit threshold for a universal gate-based system'.
Citation key: [atom-computing/atom-computing-second-generation-system:physical-qubit-count:2026-08-19]

Coherence (coherence time (nuclear-spin qubit))40 secondsvendor claim

Vendor claim

Source: Atom Computing press release (2023-10-24) and Atom Computing Whitepaper 2025 · published 2023-10-24
Method: Not stated in the press release ('qubits can store quantum information for 40 seconds'); whitepaper says information 'stays preserved for tens of seconds', citing Barnes et al., Nature Communications 2022
Citation key: [atom-computing/atom-computing-second-generation-system:coherence-time-nuclear-s:2026-08-19]

Two-qubit CZ gate fidelity (two-qubit CZ gate fidelity)99.72(3)% with post-selection; 99.40(3)% without post-selection percentvendor claim

Vendor claim

Source: Muniz, J.A. et al., 'High-fidelity universal gates in the 171Yb ground-state nuclear-spin qubit' (arXiv:2411.11708; Atom Computing-authored) · published 2024-11-18
Method: Single- and two-qubit Clifford and symmetric subspace randomized benchmarking circuits (per paper abstract)
Aggregation: Not stated in abstract (no median/best label seen)
Notes: Vendor-authored preprint (cited as ref [5] in the vendor whitepaper), not an independent third-party measurement. Post-selection vs raw distinction is load-bearing.
Citation key: [atom-computing/atom-computing-second-generation-system:two-qubit-cz-gate-fideli:2026-08-19]

One-qubit gate fidelity (one-qubit gate fidelity)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: arXiv:2411.11708 abstract (mentions single-qubit Clifford RB but states no number in the abstract); Atom Computing whitepaper 2025 (qualitative 'high fidelity' only); vendor press releases
Notes: A number may exist in the full Muniz et al. paper body; only the abstract was retrieved this session, so no figure is recorded.

Mid-circuit measurement (mid-circuit measurement)Demonstrated, 'with immediate qubit reset and reuse'vendor claim

Vendor claim

Source: Atom Computing Whitepaper 2025 · published 2025
Method: Reference: Norcia et al., 'Midcircuit Qubit Measurement and Rearrangement in a 171Yb Atomic Array', Physical Review X 13, 041034 (2023)
Citation key: [atom-computing/atom-computing-second-generation-system:mid-circuit-measurement:2026-08-19]

Readout (readout fidelity)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: Atom Computing whitepaper 2025 (describes optical fluorescence readout, no fidelity number); 2023-10-24 press release; arXiv:2411.11708 abstract

Pricing model (cloud access and pricing model)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: atom-computing.com press release and whitepaper; web search for Azure Quantum access
Notes: No public cloud access found; the 2023 PR said 'systems to be available in 2024' (on-premises model). News reports (Quantum Computing Report, The Quantum Insider, 2025-2026) describe a successor commercial system 'Magne' built with Microsoft (reported 1,225 physical / 50 logical qubits) launched with QuNorth in Denmark, Jan 2026 — recorded here as context only since it is a distinct system and was not verified from a vendor page this session.

Logical-qubit demonstrations (logical-qubit demonstrations)Architecture of 64 logical qubits shown; 24 logical qubits entangled; algorithm run with 28 logical qubits logical qubitsvendor claim

Vendor claim

Source: Atom Computing Whitepaper 2025 · published 2025
Method: Reference: Reichardt, B.W. et al., 'Logical Computation Demonstrated with a Neutral Atom Quantum Processor' (arXiv:2411.11822, Microsoft + Atom Computing)
Citation key: [atom-computing/atom-computing-second-generation-system:logical-qubit-demonstrat:2026-08-19]

QPU137 is independent and is not affiliated with, endorsed by, or sponsored by Atom Computing. 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.