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 "provenance": {
  "authors": [
   "@mathysrennela"
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  "construction": "Rotated surface code on an open 15x15 grid: bulk 2x2 plaquette checks colored by (i+j) parity, weight-2 boundary pairs on all four sides; distance 15.",
  "references": [
   "arXiv:quant-ph/9707021"
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  "date": "2026-09-20",
  "notes": "Rotated surface/toric ladder fill: standard topological configuration, distance exact by construction (a row or column of plaquettes is a weight-d logical; none lighter exists). Staged for review; novelty vs the wider literature unverified beyond the cited family origin."
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