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 },
 "distance": {
  "d": 18,
  "X": {
   "value": 18,
   "confidence": "upper_bound",
   "witness": [
    6,
    19,
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   ]
  },
  "Z": {
   "value": 18,
   "confidence": "upper_bound",
   "witness": [
    2,
    6,
    42,
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    107,
    110,
    111,
    133,
    142,
    146,
    169,
    182,
    183,
    204,
    214
   ]
  }
 },
 "provenance": {
  "authors": [
   "@MathysRennela"
  ],
  "construction": "Bivariate bicycle code QC(A,B) on Z_18 x Z_6 with weight-4 generators A = x y^4 + y^5 + x^5 y + x^10 y^2, B = x^9 y^4 + x^13 y + x^16 y^3 + x^17 (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<=18 (20k trials), corroborated by BP+OSD at 200k trials/side finding nothing lighter; exact certification not run.",
  "novelty": "new_parameters"
 },
 "family": "bivariate-bicycle"
}