Quantum computers operate in a high-dimensional space and leverage coherence, entanglement, and other exotic quantum effects. As a result, these systems are uniquely sensitive to errors in ways that their classical counterparts are not. Overcoming such errors is the central challenge for realizing successful large-scale quantum computation. Among the many error-removal methods, quantum error correction is the gold standard, but it is most effective when errors occur independently across qubits and over time—that is, when the errors have limited correlations. Now Jian-Wei Pan at the University of Science and Technology of China and his colleagues have demonstrated a novel way to suppress correlated errors caused by so-called leakage errors [1]. They have achieved this feat using a control scheme that is integrated efficiently within a single cycle of error correction. This demonstration greatly expands the class of physical error sources that can be curtailed within the architectural constraints of quantum error correction.
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