An iterative reweighting decoder for surface codes uses X-Z error correlations from circuit-level noise, improving logical error rates and raising the threshold from about 1% to 1.16%.
A single-qubit Pauli operator can be expressed as X aZ b for a, b∈ {0, 1}, up to a global phase, where X 0 = I = Z 0, X 1 = X, and Z 1 = Z
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Enhancing Fault-Tolerant Surface Code Decoding with Iterative Lattice Reweighting
An iterative reweighting decoder for surface codes uses X-Z error correlations from circuit-level noise, improving logical error rates and raising the threshold from about 1% to 1.16%.