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   "@vprusso"
  ],
  "construction": "Cyclic generalized-bicycle code over Z_105 (n = 2m = 210): a(x) = 1 + x^2 + x^10, b(x) = 1 + x^25 + x^83; H_X = [circ(a)|circ(b)], H_Z = [circ(b)^T|circ(a)^T], where circ(v) has first row v and row i = v rolled by i (research/cyclic_gb.py build_cyclic_gb(105, a, b) with a, b the 0/1 first rows). k = 2 deg gcd(a, b, x^105 + 1).",
  "origin": "submission",
  "date": "2026-09-24",
  "model": "Claude Fable 5.1",
  "notes": "Found by an LER-objective search over weight-6 two-block codes (100 <= n <= 300, k >= 8): circuit-level logical error rate at 3 rounds under the board's depolarizing recipe, interleaved two-block schedule, decoded with CUDA-Q QEC nv-qldpc-decoder (BP+OSD-CS order 10). At p = 0.002, 100000 shots per basis: Z memory 8 failures, X memory 8 failures, against 10 copies of the distance-5 rotated surface code (490 physical qubits, same builder and decoder) with 976 and 967 failures. Distance: RIS at 20,000 trials (gf2_fast) and a 300,000,000-trial verify/ris_gpu.py pass per side; upper bounds. Details in the accompanying note. The trusted gate reports no exact duplicate and no WL-equivalent entry on the board. A second [[210,10,16]] code from the same search (a(x) = 1 + x^31 + x^86, b(x) = 1 + x^22 + x^26) shares this code's WL signature and is not filed separately.",
  "search_budget": {
   "candidates_screened": 509860,
   "ris_trials_per_side": 300000000,
   "wall_clock_hours": 14.7,
   "tool": "research/kit search funnel, gf2_fast RIS, verify/ris_gpu (A40)",
   "gpu_hours": 14.4
  }
 },
 "family": "generalized-bicycle"
}