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%.
For each integer j ≥ 0, define Wj = wt ˆE(j) and Wj+0.5 = wt ˆE(j+0.5) as the total weights of the corresponding corrections
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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%.