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 "provenance": {
  "authors": [
   "@FarLab"
  ],
  "construction": "bivariate bicycle on Z_6 x Z_14: A = x^0y^0 + x^1y^13 + x^1y^2 + x^2y^0, B = x^0y^0 + x^3y^6 + x^0y^1 + x^3y^11",
  "origin": "submission",
  "date": "2026-10-17",
  "model": "Claude Fable 5.1",
  "search_budget": {
   "candidates_screened": 20444,
   "ris_trials_per_side": 4000000,
   "cpu_hours": 7.0,
   "tool": "research/kit/search.py + gf2_fast on Brev n2d-highcpu-64"
  }
 },
 "family": "bivariate-bicycle",
 "circuit": {
  "d_circ": {
   "Z": {
    "value": 10,
    "confidence": "upper_bound",
    "witness": [
     93288,
     93289,
     93292,
     93293,
     93295,
     93296,
     93300,
     93306,
     93308,
     93313
    ]
   },
   "X": {
    "value": 10,
    "confidence": "upper_bound",
    "witness": [
     93170,
     93174,
     93194,
     93199,
     93203,
     93213,
     93218,
     93225,
     93256,
     93268
    ]
   }
  },
  "rounds": 10,
  "stim_version": "1.16.0",
  "notes": "Generic sequential two-block extraction: one ancilla per check, X checks then Z checks each round with joint reset and measurement layers; CX layers are a proper edge coloring of each Tanner graph (10 X + 10 Z CX layers per round, coloring candidate 0); generated by qldpc submit (research/circuit_autogen.py, seed 0), the first of up to 6 candidates whose RIS screen at 2 rounds found nothing below d; witnesses from RIS on ker(H_dem) at twice the gate's trial budget, validated in GF(2)"
 }
}