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118, 121, 131, 139, 146, 149, 190, 195, 196, 222, 229, 240, 246, 258, 285, 286, 319, 348, 349 ] } }, "provenance": { "authors": [ "Rajpurohit, Rajendra Prasad", "Lalitha, V.", "Garani, Shayan Srinivasa", "@MathysRennela" ], "construction": "Coset lifted product (CLP) code of arXiv:2610.12782, Definition III.1, 1x1 over 2x2 layout: a protograph A over F_2[G] acting by the LEFT coset action of G on the cosets G/H, and a protograph B over F_2[N_G(H)] acting by the RIGHT coset action of the normaliser on the same cosets. G = SmallGroup(270,26), H = (non-normal, core free), m = [G:H], n = 4m = 360. Elements are named by the polycyclic generating sequence f_1,...,f_r of SmallGroup(270,26), as in the paper's Appendix A. CSS commutation is automatic (L(g) and R(n) commute for every g in G and n in N_G(H), so each block of H_X H_Z^T is L R + R L = 0 over F_2); no search for it is needed. n, k and the check weight 6 reproduce the paper's Table I exactly. Literature baseline seeded from the published parameters: this entry is a REPRODUCTION built from the paper's printed data, not a new construction and not a new parameter set. The paper certifies d = 20 by integer program; this entry carries witness-backed upper bounds from our own randomized GF(2) search, which is a weaker claim.", "references": [ "arXiv:2610.12782", "arXiv:2606.17268" ], "date": "2026-10-12", "notes": "Literature baseline: a reproduction of the published parameters in arXiv:2610.12782 (Table I), not a new construction and not a new parameter set. The group, subgroup and protographs are the paper's Appendix A data, rebuilt from GAP SmallGroup(l,i); n, k and the check weight reproduce the paper exactly. Reproduced by Space Bunny Alpha 1.0. The distance here is a witness-backed upper bound from our own randomized GF(2) search, a weaker claim than the paper's integer-program certification. See the accompanying note for the full reproduction recipe.", "origin": "baseline", "novelty": "known_parameters", "model": "Space Bunny Alpha 1.0" }, "family": "2bga-coset" }