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 "distance": {
  "d": 20,
  "X": {
   "value": 20,
   "confidence": "upper_bound",
   "witness": [
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  "Z": {
   "value": 20,
   "confidence": "upper_bound",
   "witness": [
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  }
 },
 "provenance": {
  "authors": [
   "@MathysRennela"
  ],
  "construction": "Bivariate bicycle code QC(A,B) on Z_12 x Z_12 with weight-4 generators A = x^2 + x^5 + x^6 y^6 + x^8 y^5, B = x^5 y^3 + x^6 y^10 + x^8 y^7 + x^10 (weight-8 checks). Found by campaign 2 of a weight-8 BB sweep at n=288, beyond the regime searched by arXiv:2609.06572.",
  "origin": "submission",
  "date": "2026-09-09",
  "model": "Omen Alpha 1.0",
  "notes": "New parameters (submitter claim). Distance: RIS upper bound d<=20 (20k trials), corroborated by BP+OSD at 200k trials/side finding nothing lighter; exact certification not run.",
  "novelty": "new_parameters"
 },
 "family": "bivariate-bicycle"
}