Quantinuum
Trapped-ion quantum computing built on a racetrack Quantum Charge-Coupled Device (QCCD) architecture, where ions are physically shuttled between trap zones to give all-to-all connectivity and high-fidelity two-qubit gates. Formed in 2021 from the merger of Honeywell Quantum Solutions and Cambridge Quantum; majority-owned by Honeywell. Sells H-Series systems (H1, H2, Helios) via cloud and on-premise, and ships InQuanto (quantum chemistry) and lambeq (quantum NLP) software stacks. Holds the highest published Quantum Volume scores across its H-Series generations and demonstrated, with Microsoft, logical qubits with error rates below their physical constituents.
Timeline
Current flagship
Helios — trapped-ion QCCD gen-3 (Ba+)
Milestones
- 2026-05Form S-1 publicly filed with the SEC for proposed Nasdaq IPO (ticker QNT); previously submitted confidentially in April 2026
- 2025-11Helios commercial launch — 98 Ba+ qubits, 99.921% two-qubit gate fidelity, 94-qubit GHZ state, 48 logical qubits
- 2024-0912 reliable logical qubits demonstrated on H2 with Microsoft's qubit-virtualisation system, used for an end-to-end chemistry simulation
- 2024-06H2-1 upgraded to 56 trapped-ion qubits; Quantum Volume reaches 2^23 (8,388,608) and 100x improvement over Google 2019 random-circuit-sampling benchmark
- 2024-04First logical qubits with error rates better than physical — [[7,1,3]] and [[12,2,4]] codes with up to 800x suppression, joint work with Microsoft Azure Quantum
- 2021-11Quantinuum formed from merger of Honeywell Quantum Solutions and Cambridge Quantum Computing
Roadmap
- 2026 Quantinuum Nasdaq IPO (Form S-1 publicly filed 8 May 2026; ticker QNT; previously confidentially submitted April 2026) source ↗
- 2027 Sol — first commercial 2D-grid QCCD system, scaling logical-qubit count under qLDPC codes source ↗
- 2029 Apollo — universal, fully fault-tolerant system targeting thousands of physical qubits and hundreds of logical qubits, circuits with millions of gates source ↗
Capability details
Quantum computing
- Qubit type
- trapped-ion
- Physical qubits
- 98
- Logical qubits
- 48
- 1Q gate fidelity
- 0.999975
- 2Q gate fidelity
- 0.99921
- T₁
- —
- T₂
- —
- EC code
- qLDPC
- Connectivity
- all-to-all
4 unverified fields
-
modalities.qc.coherence_t1_ms -
modalities.qc.coherence_t2_ms -
modalities.qc.gate_set -
modalities.qc.ec_code— announced as qLDPC in Helios press; no code-paper citation yet
People
- Rajeeb (Raj) Hazra — President & CEO (since 2023-02) ↗
- Ilyas Khan — Founder, Board Vice Chair & Head of Special Projects (since 2021-11) ↗
- Vimal Kapur — Chairman of the Board (since 2023) ↗
- Nitesh Sharan — Chief Financial Officer (since 2024) ↗
- Kevin Dehoff — Chief Strategy Officer & GM, Quantinuum Consulting Services (since 2024) ↗
- Larry Stack — Chief Commercial Officer (since 2024) ↗
- Lawrence Schwartz — Chief Marketing Officer (since 2024) ↗
- Kaniah Konkoly-Thege — Chief Legal Counsel & SVP Government Relations (since 2022) ↗
- Harry Buhrman — Chief Scientist for Algorithms and Innovation (since 2024) ↗
- Patty Lee — Chief Scientist for Hardware Technology Development (since 2021) ↗
- Jenni Strabley — VP & GM, Compute Platforms Group (since 2023) ↗
References
- preprint https://arxiv.org/abs/2404.02280 Paetznick, da Silva et al. — logical qubits with better-than-physical error rates on H2 (Microsoft/Quantinuum, 2024)
- press https://www.quantinuum.com/press-releases/quantinuum-announces-commercial-launch-of-new-helios-quantum-computer-that-offers-unprecedented-accuracy-to-enable-generative-quantum-ai-genqai Helios commercial launch — 98 physical qubits, 48 logical qubits (Nov 2025)
- press https://www.quantinuum.com/press-releases/quantinuum-unveils-accelerated-roadmap-to-achieve-universal-fault-tolerant-quantum-computing-by-2030 Accelerated roadmap to universal fault-tolerant QC by 2030 (Helios -> Sol -> Apollo)
- blog https://www.quantinuum.com/blog/quantinuums-h-series-hits-56-physical-qubits-that-are-all-to-all-connected-and-departs-the-era-of-classical-simulation H2 upgrade to 56 qubits, QV = 2^23
- press https://www.honeywell.com/us/en/press/2025/09/honeywell-announces-600-million-capital-raise-for-quantinuum-at-10b-pre-money-equity-valuation-to-advance-quantum-computing-at-scale $600M capital raise at $10B pre-money valuation (Sep 2025); Honeywell remains majority owner (~54%)