Quantinuum Reports a 10x Reduction in Logical Error Rate on Helios

Insider Brief

• Quantinuum reported 99.9995% logical fidelity on its Helios quantum computer using a color code, equivalent to five errors per million operations and a tenfold reduction from its previous result.
• Logical errors decreased exponentially as code distance increased, with each tested increase reducing remaining errors by a factor of 12.
• Tests on the same Helios hardware showed a tradeoff between codes, with Helix using 10 physical qubits per logical qubit while the color code used up to 37 but achieved lower logical error rates.
• Image: Rendering of a deployed Helios system. (Quantinuum)

PRESS RELEASE — Quantinuum (NASDAQ: QNT), a leading full-stack quantum computing company, today announced a world-record quantum error-correction result, achieving a logical fidelity of 99.9995% on its Helios commercial computer using the company’s error-correction architecture. This marks Quantinuum’s second breakthrough in two months, demonstrating how its highly accurate trapped-ion hardware and flexible architecture work together to deliver rapid improvements in accuracy.

The achievement reinforces Quantinuum’s error-correction leadership and validates that its accuracy performance is now within the target range for Apollo, the company’s planned universal fault-tolerant quantum computer expected to be available by 2029.