About
Quantinuum, formed by the merger of Honeywell Quantum Solutions and Cambridge Quantum, is a quantum computing company pursuing the first universal fault-tolerant quantum computer. The company describes its hardware as the most accurate commercial general-purpose quantum computer, with industry-leading gate fidelities. In September 2025, Quantinuum raised $600 million at a $10 billion pre-money valuation, led by Quanta Computer, NVentures (NVIDIA's venture arm), and QED Investors, with participation from JPMorganChase, Mitsui, Amgen, Cambridge Quantum Holdings, Serendipity Capital, and Honeywell. A previous round in January 2024 raised $300 million at a $5B valuation. On 26 May 2026, the company filed its S-1 with the SEC. Quantinuum listed on Nasdaq under the ticker QNT on 4 June 2026, raising approximately $1.05 billion through approximately 21 million Class A shares — the largest pure-play quantum-computing IPO to date, at a valuation of up to $12.7 billion. The stock opened at $60.38 on its first day of trading. In May 2026, Quantinuum also disclosed a strategic collaboration with Synopsys to integrate quantum computing into EDA workflows for simulation and design optimization. In November 2025, Quantinuum launched Helios with 98 barium ion qubits, upgraded from 56 ytterbium qubits, reaching roughly 99.92% two-qubit gate fidelity. Helios supports up to 48 fully error-corrected logical qubits at a 2:1 encoding rate. The switch from ytterbium to barium ions allows visible-light laser manipulation, improving cost, component lifetime, and scalability. The system integrates an NVIDIA GB200 for real-time error decoding with on-the-fly error correction. Helios reached a Quantum Volume of 33.5 million, the highest ever recorded and 16,000 times better than the nearest competitor, and demonstrated 94 logical qubits in error-detected mode alongside the 48 in fully error-corrected mode. In late 2025, Quantinuum created the largest-ever GHZ state with 50 entangled logical
Quantum Specifications
| Qubit Technology | Ion-trap |
| Physical Qubits | 98 |
| Logical Qubits | 48 |
| 2Q Gate Fidelity | 99.921% |
| Error Correction | Iceberg-concatenated |
| Quantum Focus | hardware |
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