Quantum-computing developer Quantinuum reported 99.9995% logical memory fidelity on Helios, equivalent to roughly five failures per million cycles.

Quantinuum reported a new error-correction result on its Helios quantum computer. The stated measurement is 99.9995% logical memory fidelity, corresponding to approximately five failures per million cycles.

The result concerns logical memory, not a disclosed measure of complete application accuracy or overall computational throughput. The supplied HPCwire excerpt does not provide the experiment’s qubit count, code configuration, cycle duration, or statistical uncertainty.

Quantinuum said the result increased its confidence in its 2029 target for Apollo, its planned fault-tolerant quantum system. Apollo remains a development target; the reported Helios measurement does not establish that Apollo has been completed or that its timetable is guaranteed.