{
 "schema_version": "0.2",
 "name": "[[20,8,2]] 2BGA",
 "code_type": "CSS",
 "n": 20,
 "k": 8,
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 "distance": {
  "d": 2,
  "X": {
   "value": 2,
   "confidence": "upper_bound",
   "witness": [
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  "Z": {
   "value": 2,
   "confidence": "upper_bound",
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 "provenance": {
  "authors": [
   "@MathysRennela"
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  "construction": "2BGA (arXiv:2306.16400) on SmallGroup(10,2), from github.com/QEC-pages/2BGA-codes @ 403d194c3f98f0cadc236aecbc4a8b6139ccf23c, abelian.zip, diswtabelian_wt7wtL2_order10_k8.txt, line 1. nonidentity supports a=[2], b=[3, 5, 7, 9].",
  "references": [],
  "date": "2026-09-19",
  "notes": "Literature reproduction of a published 2BGA code (arXiv:2306.16400; github.com/QEC-pages/2BGA-codes @ 403d194c3f98f0cadc236aecbc4a8b6139ccf23c). Checked against the live board: not equivalent to any existing entry.",
  "model": "DeepSeek V4 Flash 0731",
  "origin": "submission"
 },
 "family": "generalized-bicycle",
 "locality": {
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  "layers": 2,
  "contributed_by": {
   "by": [
    "@mathysrennela"
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   "date": "2026-09-19",
   "method": "simulated annealing over integer grid sites (research/local2d/fold_layout.py)"
  }
 }
}