Quantinuum

What Quantinuum does

Quantinuum builds quantum computers and the software used to program them. Its machines are trapped-ion systems. In these, electrically charged atoms held in place by electromagnetic fields serve as qubits, the basic units of quantum information. The company was formed in November 2021 by combining Honeywell Quantum Solutions and Cambridge Quantum, a UK quantum software company. Its IPO prospectus gives its headquarters as Broomfield, Colorado.

Its flagship system, Helios, launched on November 5, 2025 with 98 physical qubits. Quantinuum reports a two-qubit gate fidelity of 99.921% for the machine. Fidelity measures how accurately a quantum computer performs its operations. The company offers it through its cloud service or on customers' premises.

Why it matters

Quantum computers make errors as they compute. A major goal in the field is fault tolerance. This means a collection of physical qubits encodes a single logical qubit so that errors can be corrected. IEEE Spectrum reported in June 2026 that QuEra, claiming 96 logical qubits, and Quantinuum, claiming 94, held the records. Quantinuum's launch release describes those 94 as error-detected and lists 48 error-corrected logical qubits. The prospectus says the company expects to introduce two systems: Sol in 2027 with up to 100 logical qubits, and Apollo in 2029 with hundreds.

Some researchers question how much such counts mean. Jay Sau, a University of Maryland physicist quoted by IEEE Spectrum, said logical qubits as now defined are only somewhat better than single qubits. Without a major leap in device quality, he said, he saw no scientific question a quantum computer could help with in 2028. The prospectus warns that quantum computing may never achieve commercially relevant advantage and that the company has a history of losses.

Recent developments

• Honeywell announced a roughly $600 million funding round for Quantinuum in September 2025 at a $10 billion pre-money valuation, with new investors including Quanta Computer and Nvidia's venture arm.
• Quantinuum closed its initial public offering on June 5, 2026. It sold 28 million Class A shares at $60 each for gross proceeds of $1.68 billion and listed on Nasdaq as QNT. Honeywell entities were to hold about 47.8% of voting power on completion of the offering, according to the prospectus.
• In its second-quarter results on August 11, 2026, the company posted revenue of $8 million, up from $2 million a year earlier. It posted a net loss of $597 million, compared with $57 million. It held $2.1 billion in cash and short-term investments and forecast 2026 revenue of $28 million to $32 million. Revenue in 2025 was $30.9 million, per the prospectus.
• The same day it announced a multi-year partnership with Oracle. The aim is to deploy Helios in an Oracle Cloud Infrastructure data center and offer it as a cloud service.
• On September 8, 2026, it announced it had finalized a $100 million research award from the US Department of Commerce under the CHIPS and Science Act. A securities filing describes the award as up to $100 million. It shows the department received 2,369,528 Class A shares in connection with it, with $56 million made available upfront.

What to watch

In August 2026 Quantinuum said the trap chip for Sol, the next system on its roadmap, was back from fabrication and in validation. It said Apollo remained on schedule for 2029. The remaining CHIPS payments of $32 million and $12 million depend on project milestones.

After two executive orders on quantum technology signed on June 22, 2026, the Department of Energy committed to deploying a fault-tolerant quantum computer by 2028, IEEE Spectrum reported.