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 },
 "distance": {
  "d": 21,
  "X": {
   "value": 21,
   "confidence": "upper_bound",
   "witness": [
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   ]
  },
  "Z": {
   "value": 21,
   "confidence": "upper_bound",
   "witness": [
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    199
   ]
  }
 },
 "provenance": {
  "authors": [
   "@MathysRennela"
  ],
  "construction": "Bivariate bicycle code QC(A,B) on Z_27 x Z_4 with weight-4 generators A = x^3 y^3 + x^13 y^3 + x^18 + x^25, B = x^3 y^3 + x^21 + x^22 + x^25 y (weight-8 checks). Found by campaign 2 of a weight-8 BB sweep at n in {192, 216, 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<=21 (20k trials), corroborated by BP+OSD at 200k trials/side finding nothing lighter; exact certification not run.",
  "novelty": "new_parameters"
 },
 "family": "bivariate-bicycle"
}