{
 "schema_version": "0.1",
 "name": "[[80,26,7]] 2BGA-derived hyperplane subgroup w10 D8 I540",
 "code_type": "CSS",
 "n": 80,
 "k": 26,
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 "distance": {
  "d": 7,
  "X": {
   "value": 7,
   "confidence": "upper_bound",
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 "provenance": {
  "authors": [
   "@hirobumii"
  ],
  "construction": "Rank-one-per-sector stabilizer subgroup of the public @FarLab 2BGA code [[80,24,8]] on ab(5,2,2,2). Parent exact Git blob43dae9d893a9f2b5c37480d6df4dbc2e10ac423f, JSON SHA256a35525e02f719c21c60a548078777d280286010cd0ef5f5eb5fae93db27653a6, at https://github.com/unitaryfoundation/qldpc-challenge/blob/15e58eea2bba862eb49a8a162fa801f81d027f5a/codes/80-24-8.json. Select these zero-indexed rows directly from its literal checks: X=[24, 32, 5, 16, 25, 4, 9, 8, 27, 35, 36, 28, 21, 15, 0, 20, 29, 3, 38, 13, 30, 23, 2, 39, 12, 22, 31];Z=[22, 32, 7, 27, 23, 6, 33, 9, 24, 10, 34, 4, 35, 11, 21, 3, 30, 19, 2, 13, 31, 14, 1, 28, 0, 39, 17]. The resulting ranks are27+27 and actual(n,k,d,w,D,M,I)=[80, 26, 7, 10, 8, 54, 540]. No entangling transformation or inherited distance assumption is used.",
  "references": [
   "https://github.com/unitaryfoundation/qldpc-challenge/blob/15e58eea2bba862eb49a8a162fa801f81d027f5a/codes/80-24-8.json"
  ],
  "date": "2026-10-17",
  "notes": "Displayed presentation: maximum check weight 10, maximum qubit degree 8, 54 checks and total incidence 540.",
  "model": "GPT-6 Astra + GPT-6.1 Sol (recorded multi-agent configuration)"
 }
}