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    279,
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   [
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   [
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    231,
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   [
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    143,
    154,
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   [
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   [
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   [
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   [
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   [
    36,
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    232,
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   [
    146,
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   [
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    151,
    158,
    302,
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   [
    45,
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    306
   ],
   [
    150,
    152,
    153,
    161,
    305,
    307
   ]
  ]
 },
 "distance": {
  "d": 24,
  "X": {
   "value": 24,
   "confidence": "upper_bound",
   "witness": [
    2,
    63,
    67,
    71,
    73,
    75,
    79,
    81,
    82,
    85,
    87,
    89,
    92,
    94,
    165,
    185,
    188,
    193,
    214,
    217,
    228,
    236,
    249,
    255
   ]
  },
  "Z": {
   "value": 24,
   "confidence": "upper_bound",
   "witness": [
    15,
    37,
    44,
    46,
    77,
    80,
    88,
    116,
    120,
    124,
    140,
    144,
    190,
    200,
    220,
    242,
    271,
    273,
    280,
    282,
    284,
    288,
    289,
    307
   ]
  }
 },
 "provenance": {
  "authors": [
   "Zijian Liang",
   "Ke Liu",
   "Hao Song",
   "Yu-An Chen"
  ],
  "construction": "Twisted-torus bivariate-bicycle code from Generalized toric codes on twisted tori for quantum error correction (PRX Quantum 6, 020357, 2025). Stabilizers f(x,y)=1+x+x^-1y^-2, g(x,y)=1+y+x^2y^-1 on the abelian quotient group Z^2/L with twist basis a_1=[0, 77], a_2=[2, -13] (n=2|det[a_1,a_2]|=2*154). Reconstructed from the published polynomials and twist; CSS form H_X=[f|g], H_Z=[gbar|fbar].",
  "references": [
   "arXiv:2503.03827"
  ],
  "date": "2025",
  "notes": "Reconstructed baseline from Liang, Liu, Song, Chen, Generalized toric codes on twisted tori for quantum error correction (PRX Quantum 6, 020357, 2025), arXiv:2503.03827. The [[n,k,d]] parameter set and stabilizer polynomials are published in that paper; this entry reproduces them. Distance is an upper bound per the paper (probabilistic for d>20); the witness is the surrogate logical of that weight. Seeded to fill a board coverage gap at this block size, not a discovery.",
  "origin": "baseline",
  "novelty": "known_parameters"
 },
 "family": "bivariate-bicycle"
}