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    217,
    226
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    81,
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    145,
    218,
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    261
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    219,
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    229
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    218,
    229,
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    93,
    119,
    219,
    230,
    239
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    84,
    94,
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    220,
    231,
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    85,
    95,
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    221,
    232,
    241
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    86,
    96,
    122,
    222,
    233,
    242
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    87,
    97,
    123,
    223,
    234,
    243
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   [
    88,
    98,
    124,
    224,
    235,
    244
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    13,
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    139,
    236,
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    278
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    14,
    90,
    100,
    237,
    246,
    279
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   [
    91,
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    126,
    227,
    238,
    247
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    92,
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    228,
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    242,
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    232,
    243,
    252
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    97,
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    233,
    244,
    253
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    18,
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    143,
    245,
    254,
    284
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    19,
    99,
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    246,
    255,
    285
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    20,
    100,
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    236,
    247,
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    237,
    248,
    257
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    242,
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    24,
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    263,
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    25,
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    255,
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    26,
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   [
    27,
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    140,
    247,
    258,
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    112,
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    141,
    248,
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    249,
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    269
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    2,
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    250,
    261,
    270
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    115,
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    142,
    251,
    262,
    271
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    32,
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    126,
    264,
    272,
    291
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   [
    33,
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    127,
    254,
    265,
    273
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   [
    34,
    119,
    128,
    255,
    266,
    274
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   [
    35,
    120,
    129,
    256,
    267,
    275
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   [
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    268,
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   [
    3,
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    131,
    258,
    269,
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   [
    4,
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    259,
    270,
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   [
    5,
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    260,
    271,
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   [
    41,
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    263,
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   [
    42,
    127,
    135,
    264,
    274,
    281
   ],
   [
    43,
    128,
    136,
    265,
    275,
    282
   ],
   [
    6,
    130,
    137,
    267,
    277,
    283
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   [
    7,
    131,
    138,
    268,
    278,
    284
   ],
   [
    8,
    132,
    139,
    269,
    279,
    285
   ],
   [
    51,
    134,
    140,
    272,
    281,
    286
   ],
   [
    52,
    135,
    141,
    273,
    282,
    287
   ],
   [
    11,
    137,
    142,
    276,
    284,
    288
   ],
   [
    12,
    138,
    143,
    277,
    285,
    289
   ],
   [
    61,
    140,
    144,
    280,
    287,
    290
   ],
   [
    17,
    142,
    145,
    283,
    289,
    291
   ]
  ]
 },
 "distance": {
  "d": 8,
  "X": {
   "value": 8,
   "confidence": "upper_bound",
   "witness": [
    9,
    14,
    30,
    55,
    65,
    90,
    155,
    201
   ]
  },
  "Z": {
   "value": 8,
   "confidence": "upper_bound",
   "witness": [
    57,
    118,
    171,
    193,
    203,
    229,
    254,
    264
   ]
  }
 },
 "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+y^2, g(x,y)=1+y+x^-4y on the abelian quotient group Z^2/L with twist basis a_1=[0, 73], a_2=[2, 32] (n=2|det[a_1,a_2]|=2*146). 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"
}