{
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 "name": "[[17,1,5]]",
 "code_type": "CSS",
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 "k": 1,
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   "confidence": "upper_bound",
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 "provenance": {
  "authors": [
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  "construction": "Planar 4.8.8 color code patch at distance 5 (the d = 4m+1 class open in arXiv:2609.21376): (3,5,5,3,1) region on the paper's lattice frame, 4 bulk-rule faces + 4 boundary completions (2 extra boundary squares, 2 octagon corner truncations) found by exhaustive compatible-subset search; H_X = H_Z = face-incidence matrix.",
  "origin": "submission",
  "date": "2026-09-21",
  "model": "GLM 5.3 Flash",
  "notes": "Same parameters as the existing 17-1-5 entry (doubling construction, arXiv:2608.11160) and the gate flags the two as possibly equivalent (same WL signature) - this entry is the same abstract code reached by a different route: a 4.8.8 brickwork boundary answering the d = 4m+1 open question of arXiv:2609.21376. The contribution is the layout: measured interaction radius sqrt(13) ~ 3.606 puts it in local-2d-single, where the incumbent (radius 4.2, local-2d-bilayer) cannot follow. Distance: witness-backed upper bound d <= 5 both sides, held at 500k RIS trials/side across three seeds. Model: GLM 5.3 Flash."
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