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   "Lee, Gideon"
  ],
  "construction": "Two-block group-algebra code C(a,b) of arXiv:2610.13880 (Sec. 3) over the non-abelian group C5 x (C3 : C8) (GAP SmallGroup(120,1), order 120): H_X = (L(a) | R(b)), H_Z = (R(b)^T | L(a)^T) with L and R the left and right regular representations, a = e0 + e6 + e15, b = e0 + e11 with elements numbered as GAP's Elements(SmallGroup(120,1)), e0 the identity. Taken from record 5859f45864653ece of the paper's database (github.com/gideonlsx/bicycle-race @ aed705a, data/codes.jsonl, CC BY 4.0), whose data/groups.jsonl gives the generators' right-multiplication permutations in that numbering; qubits 0..119 are the left block and 120..239 the right block. Rebuilt from the database's group data; CSS commutation, k, check weight and both of the paper's witnesses were re-checked on the rebuilt matrices.",
  "origin": "baseline",
  "date": "2026-10-12",
  "model": "Claude Fable 5.1 (Claude Code)",
  "notes": "Literature reconstruction. The paper states d = 18 exactly (d_X: ladder (cluster engine, default plan), no target; d_Z: ladder (cluster engine, default plan), no target; verification record: new (beats cited [[192,4,16]], 5.33)). Readings here: qldpc submit's RIS (20,000 NumPy trials per side) and its 2,000,000-trial accelerator pass, plus the verifier's refutation search; witnessed upper bound, see notes/240-4-18.md.",
  "novelty": "known_parameters",
  "references": [
   "arXiv:2610.13880"
  ]
 },
 "family": "generalized-bicycle"
}