Summary

Quantum computers will not become useful until researchers perfect methods for correcting errors that these devices naturally make. Quantum error-correction (QEC) techniques have advanced rapidly in recent years, but several studies now suggest that the landscape of errors they must tackle is unexpectedly complex, which poses new challenges for making quantum computers practical. The idea of QEC dates back to the very inception of quantum computing and the first investigations of how quantum computers could be put to work.

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