Demonstration of Logical Error Suppression in a Surface Code Memory on a Cloud-Accessible IBM Superconducting Processor
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Shuwen Kan, Aaron Hoyt, Sean Garner, Ethan Vo, Adrian Harkness, Rod Rofougaran et al. · arXiv: 2610.23840v1 · Summary page
Why cover this story this week?
A better quantum memory—and a warning from long runs
Quantum error correction spreads information across physical qubits so that a larger code can, under suitable noise conditions, make a more reliable logical memory. On a cloud-accessible IBM superconducting processor, researchers report improved surface-code memory performance by combining shorter readout, fused measurement and reset, and protective echo operations on data qubits during readout. Increasing the code’s protected distance from three to six, while keeping its other distance fixed, reduced per-round logical error rates from about 0.5 percent to roughly 0.2 percent in both tested memory bases.
The improvements came with important qualifications. Performance varied with the chosen region of the processor, and the advantage of larger codes weakened in experiments lasting up to 150 error-correction rounds. Long-lived correlations may indicate a persistent error component. The preprint therefore offers both evidence of logical error suppression and a useful account of its limits: better circuits help, but dependable memories also require attention to hardware variation and errors that persist over time.
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