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    "found_at_samples": 400,
    "survived_samples": 400,
    "tool": "research/kit/surrogate.lightest_logical",
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 "provenance": {
  "authors": [
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  "construction": "Coset code Q_G^H(ahat,bhat) of arXiv:2606.17268; G=SmallGroup(224,53), H the 9th non-normal subgroup, ahat=[1,11,59,81], bhat=[1,15,23,25]",
  "origin": "submission",
  "date": "2026-10-23",
  "model": "Beam 1.0",
  "references": [
   "arXiv:2606.17268"
  ],
  "novelty": "known_parameters"
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 "family": "2bga-coset",
 "circuit": {
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   "Z": {
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    "confidence": "upper_bound",
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    "confidence": "upper_bound",
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  "rounds": 10,
  "stim_version": "1.16.0",
  "notes": "Johnson-coil flagged interleaved two-block extraction (max_flags=4 per check, 9 data CX slots per round, X-check term slots [2, 7, 6, 1, 3, 5, 8, 4], Z-check term slots [6, 1, 2, 7, 4, 3, 0, 5] over terms A_0..A_3, B_0..B_3); generated by qldpc submit (research/circuit_autogen.py, seed 0), the first of up to 6 candidates whose RIS screen at 2 rounds found nothing below d; witnesses from RIS on ker(H_dem) at twice the gate's trial budget, validated in GF(2)",
  "contributed_by": {
   "by": [
    "@vprusso"
   ],
   "date": "2026-11-06",
   "method": "circuit_autogen schedule search (two-block interleaved, then layout, then generic), verified by verify/circuit_verify.py before writing"
  }
 }
}