Quantinuum Achieves Record Quantum Fidelity Rate
The company reached 99.9995% logical memory fidelity on its Helios quantum computer.
Updated on Oct. 19, 2026 in Quantum Computing
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Quantinuum has achieved a 99.9995% logical memory fidelity rate on its Helios quantum computer, a milestone representing roughly five failures per million cycles. This breakthrough validates a scalable error-correction method intended to support the company's future fault-tolerant systems.
Why it matters
These results provide a critical foundation for developing the 2D-grid-based Sol quantum computer and the eventual Apollo fault-tolerant system. By demonstrating this error-correction capability, Quantinuum aims to support 100 logical qubits using approximately 30,000 physical qubits.
The Helios system recorded a twelvefold reduction in logical memory errors during color-code experiments. The approach outlines a requirement of 30,000 physical qubits to support 100 logical qubits, compared to 900,000 for superconducting methods.
The players
Quantinuum
Quantinuum is a quantum computing company formed by the merger of Honeywell Quantum Solutions and Cambridge Quantum.
The details
Quantinuum utilizes color-code experiments and code distance to increase error protection by incorporating additional physical qubits. These findings are currently being used to guide the engineering of the upcoming Sol quantum architecture.
Timeline
June 2026: Quantinuum raised nearly $1.7 billion in an initial public offering.
October 19, 2026: Article publication date.
2029: Planned delivery of the Apollo fault-tolerant system.
The Tech Race
The recent fidelity milestone marks a foundational step toward the realization of the Apollo fault-tolerant system. This development signals a departure from traditional superconducting implementations that require significantly higher physical qubit counts.
While the technology is currently in the research and development phase, these milestones accelerate the timeline for practical quantum computing applications. Increased error fidelity is a necessary precursor to eventually providing commercial-grade computing power for complex industry problems.
The takeaway
Quantinuum is leveraging high-fidelity memory results to streamline the path toward fault-tolerant computing architectures. Continued success in scaling these methods remains essential for the industry to transition from experimental hardware to reliable, large-scale systems.
Further reading
Learn more about advancements in the field at Quantum Computing.
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