Quantinuum sets quantum error-correction record — SkimNews
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- Quantinuum achieved the lowest error rate yet for logical qubits on its Helios-1 quantum computer, with logical qubits making as few as five errors per million qubit uses — down from hundreds of errors per million in prior experiments.
- Helios-1 contains 98 ion-trap qubits; researchers applied a "colour code" error-correction scheme alongside corrective laser pulses that counteract deleterious energy shifts in individual qubits.
- When two logical qubits performed a simple error-corrected calculation, the error rate rose to roughly seven errors per 100,000 qubit uses — about ten times higher than during information storage.
- Error rates diminished twelve-fold as the logical qubit grew from seven to 19 physical qubits, with a similar drop from 19 to 37 physical qubits — a scaling property experts consider essential for building useful quantum machines.
- Steven Flammia at Virginia Tech said the result sets the course for John Preskill's "megaquop" machine, a computer capable of one million reliable quantum operations.
- Thomas Wong at Creighton University noted Helios-1's ~100 physical qubits are insufficient — roughly 100 logical qubits would be needed for known useful megaquop applications, while Quantinuum's next machine, Sol, will be nearly twice as large.
- QuEra has announced plans to build a megaquop machine by 2028, highlighting that several competitors already operate prototypes with more than a thousand qubits.
Why it matters: Quantinuum has demonstrated the first logical-qubit error rate low enough to meet the "megaquop" threshold of one million reliable operations, but at ~100 physical qubits the system is still far short of the roughly 100 logical qubits experts say are needed for scientifically useful applications — and competitor QuEra targets a megaquop machine by 2028.
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