Leiden University and Riverlane Research Reveals Distance-Losing Flaw in Correlated Decoding Below Threshold

Leiden University and Riverlane research uncovered a flaw in correlated decoding, causing a loss of effective code distance and higher logical failure rates in quantum error correction. They introduced a new regularization parameter to fix this, restoring nominal distance scaling and improving accuracy without adding computational overhead. This discovery offers a crucial design principle for future quantum decoding architectures.

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