{
 "schema_version": "0.3",
 "name": "orchestrator bb-w4-mid it810 [[160,4,20]]",
 "code_type": "CSS",
 "n": 160,
 "k": 4,
 "checks": {
  "X": [
   [
    28,
    43,
    45,
    77,
    82,
    98,
    132,
    139
   ],
   [
    29,
    44,
    46,
    78,
    83,
    99,
    130,
    133
   ],
   [
    20,
    45,
    47,
    79,
    84,
    90,
    131,
    134
   ],
   [
    21,
    46,
    48,
    70,
    85,
    91,
    132,
    135
   ],
   [
    22,
    47,
    49,
    71,
    86,
    92,
    133,
    136
   ],
   [
    23,
    40,
    48,
    72,
    87,
    93,
    134,
    137
   ],
   [
    24,
    41,
    49,
    73,
    88,
    94,
    135,
    138
   ],
   [
    25,
    40,
    42,
    74,
    89,
    95,
    136,
    139
   ],
   [
    26,
    41,
    43,
    75,
    80,
    96,
    130,
    137
   ],
   [
    27,
    42,
    44,
    76,
    81,
    97,
    131,
    138
   ],
   [
    7,
    38,
    53,
    55,
    92,
    108,
    142,
    149
   ],
   [
    8,
    39,
    54,
    56,
    93,
    109,
    140,
    143
   ],
   [
    9,
    30,
    55,
    57,
    94,
    100,
    141,
    144
   ],
   [
    0,
    31,
    56,
    58,
    95,
    101,
    142,
    145
   ],
   [
    1,
    32,
    57,
    59,
    96,
    102,
    143,
    146
   ],
   [
    2,
    33,
    50,
    58,
    97,
    103,
    144,
    147
   ],
   [
    3,
    34,
    51,
    59,
    98,
    104,
    145,
    148
   ],
   [
    4,
    35,
    50,
    52,
    99,
    105,
    146,
    149
   ],
   [
    5,
    36,
    51,
    53,
    90,
    106,
    140,
    147
   ],
   [
    6,
    37,
    52,
    54,
    91,
    107,
    141,
    148
   ],
   [
    17,
    48,
    63,
    65,
    102,
    118,
    152,
    159
   ],
   [
    18,
    49,
    64,
    66,
    103,
    119,
    150,
    153
   ],
   [
    19,
    40,
    65,
    67,
    104,
    110,
    151,
    154
   ],
   [
    10,
    41,
    66,
    68,
    105,
    111,
    152,
    155
   ],
   [
    11,
    42,
    67,
    69,
    106,
    112,
    153,
    156
   ],
   [
    12,
    43,
    60,
    68,
    107,
    113,
    154,
    157
   ],
   [
    13,
    44,
    61,
    69,
    108,
    114,
    155,
    158
   ],
   [
    14,
    45,
    60,
    62,
    109,
    115,
    156,
    159
   ],
   [
    15,
    46,
    61,
    63,
    100,
    116,
    150,
    157
   ],
   [
    16,
    47,
    62,
    64,
    101,
    117,
    151,
    158
   ],
   [
    27,
    58,
    73,
    75,
    82,
    89,
    112,
    128
   ],
   [
    28,
    59,
    74,
    76,
    80,
    83,
    113,
    129
   ],
   [
    29,
    50,
    75,
    77,
    81,
    84,
    114,
    120
   ],
   [
    20,
    51,
    76,
    78,
    82,
    85,
    115,
    121
   ],
   [
    21,
    52,
    77,
    79,
    83,
    86,
    116,
    122
   ],
   [
    22,
    53,
    70,
    78,
    84,
    87,
    117,
    123
   ],
   [
    23,
    54,
    71,
    79,
    85,
    88,
    118,
    124
   ],
   [
    24,
    55,
    70,
    72,
    86,
    89,
    119,
    125
   ],
   [
    25,
    56,
    71,
    73,
    80,
    87,
    110,
    126
   ],
   [
    26,
    57,
    72,
    74,
    81,
    88,
    111,
    127
   ],
   [
    3,
    5,
    37,
    68,
    92,
    99,
    122,
    138
   ],
   [
    4,
    6,
    38,
    69,
    90,
    93,
    123,
    139
   ],
   [
    5,
    7,
    39,
    60,
    91,
    94,
    124,
    130
   ],
   [
    6,
    8,
    30,
    61,
    92,
    95,
    125,
    131
   ],
   [
    7,
    9,
    31,
    62,
    93,
    96,
    126,
    132
   ],
   [
    0,
    8,
    32,
    63,
    94,
    97,
    127,
    133
   ],
   [
    1,
    9,
    33,
    64,
    95,
    98,
    128,
    134
   ],
   [
    0,
    2,
    34,
    65,
    96,
    99,
    129,
    135
   ],
   [
    1,
    3,
    35,
    66,
    90,
    97,
    120,
    136
   ],
   [
    2,
    4,
    36,
    67,
    91,
    98,
    121,
    137
   ],
   [
    13,
    15,
    47,
    78,
    102,
    109,
    132,
    148
   ],
   [
    14,
    16,
    48,
    79,
    100,
    103,
    133,
    149
   ],
   [
    15,
    17,
    49,
    70,
    101,
    104,
    134,
    140
   ],
   [
    16,
    18,
    40,
    71,
    102,
    105,
    135,
    141
   ],
   [
    17,
    19,
    41,
    72,
    103,
    106,
    136,
    142
   ],
   [
    10,
    18,
    42,
    73,
    104,
    107,
    137,
    143
   ],
   [
    11,
    19,
    43,
    74,
    105,
    108,
    138,
    144
   ],
   [
    10,
    12,
    44,
    75,
    106,
    109,
    139,
    145
   ],
   [
    11,
    13,
    45,
    76,
    100,
    107,
    130,
    146
   ],
   [
    12,
    14,
    46,
    77,
    101,
    108,
    131,
    147
   ],
   [
    8,
    23,
    25,
    57,
    112,
    119,
    142,
    158
   ],
   [
    9,
    24,
    26,
    58,
    110,
    113,
    143,
    159
   ],
   [
    0,
    25,
    27,
    59,
    111,
    114,
    144,
    150
   ],
   [
    1,
    26,
    28,
    50,
    112,
    115,
    145,
    151
   ],
   [
    2,
    27,
    29,
    51,
    113,
    116,
    146,
    152
   ],
   [
    3,
    20,
    28,
    52,
    114,
    117,
    147,
    153
   ],
   [
    4,
    21,
    29,
    53,
    115,
    118,
    148,
    154
   ],
   [
    5,
    20,
    22,
    54,
    116,
    119,
    149,
    155
   ],
   [
    6,
    21,
    23,
    55,
    110,
    117,
    140,
    156
   ],
   [
    7,
    22,
    24,
    56,
    111,
    118,
    141,
    157
   ],
   [
    18,
    33,
    35,
    67,
    88,
    122,
    129,
    152
   ],
   [
    19,
    34,
    36,
    68,
    89,
    120,
    123,
    153
   ],
   [
    10,
    35,
    37,
    69,
    80,
    121,
    124,
    154
   ],
   [
    11,
    36,
    38,
    60,
    81,
    122,
    125,
    155
   ],
   [
    12,
    37,
    39,
    61,
    82,
    123,
    126,
    156
   ],
   [
    13,
    30,
    38,
    62,
    83,
    124,
    127,
    157
   ],
   [
    14,
    31,
    39,
    63,
    84,
    125,
    128,
    158
   ],
   [
    15,
    30,
    32,
    64,
    85,
    126,
    129,
    159
   ],
   [
    16,
    31,
    33,
    65,
    86,
    120,
    127,
    150
   ],
   [
    17,
    32,
    34,
    66,
    87,
    121,
    128,
    151
   ]
  ],
  "Z": [
   [
    8,
    31,
    38,
    72,
    93,
    125,
    127,
    142
   ],
   [
    9,
    32,
    39,
    73,
    94,
    126,
    128,
    143
   ],
   [
    0,
    30,
    33,
    74,
    95,
    127,
    129,
    144
   ],
   [
    1,
    31,
    34,
    75,
    96,
    120,
    128,
    145
   ],
   [
    2,
    32,
    35,
    76,
    97,
    121,
    129,
    146
   ],
   [
    3,
    33,
    36,
    77,
    98,
    120,
    122,
    147
   ],
   [
    4,
    34,
    37,
    78,
    99,
    121,
    123,
    148
   ],
   [
    5,
    35,
    38,
    79,
    90,
    122,
    124,
    149
   ],
   [
    6,
    36,
    39,
    70,
    91,
    123,
    125,
    140
   ],
   [
    7,
    30,
    37,
    71,
    92,
    124,
    126,
    141
   ],
   [
    2,
    18,
    41,
    48,
    103,
    135,
    137,
    152
   ],
   [
    3,
    19,
    42,
    49,
    104,
    136,
    138,
    153
   ],
   [
    4,
    10,
    40,
    43,
    105,
    137,
    139,
    154
   ],
   [
    5,
    11,
    41,
    44,
    106,
    130,
    138,
    155
   ],
   [
    6,
    12,
    42,
    45,
    107,
    131,
    139,
    156
   ],
   [
    7,
    13,
    43,
    46,
    108,
    130,
    132,
    157
   ],
   [
    8,
    14,
    44,
    47,
    109,
    131,
    133,
    158
   ],
   [
    9,
    15,
    45,
    48,
    100,
    132,
    134,
    159
   ],
   [
    0,
    16,
    46,
    49,
    101,
    133,
    135,
    150
   ],
   [
    1,
    17,
    40,
    47,
    102,
    134,
    136,
    151
   ],
   [
    12,
    28,
    51,
    58,
    82,
    113,
    145,
    147
   ],
   [
    13,
    29,
    52,
    59,
    83,
    114,
    146,
    148
   ],
   [
    14,
    20,
    50,
    53,
    84,
    115,
    147,
    149
   ],
   [
    15,
    21,
    51,
    54,
    85,
    116,
    140,
    148
   ],
   [
    16,
    22,
    52,
    55,
    86,
    117,
    141,
    149
   ],
   [
    17,
    23,
    53,
    56,
    87,
    118,
    140,
    142
   ],
   [
    18,
    24,
    54,
    57,
    88,
    119,
    141,
    143
   ],
   [
    19,
    25,
    55,
    58,
    89,
    110,
    142,
    144
   ],
   [
    10,
    26,
    56,
    59,
    80,
    111,
    143,
    145
   ],
   [
    11,
    27,
    50,
    57,
    81,
    112,
    144,
    146
   ],
   [
    22,
    38,
    61,
    68,
    92,
    123,
    155,
    157
   ],
   [
    23,
    39,
    62,
    69,
    93,
    124,
    156,
    158
   ],
   [
    24,
    30,
    60,
    63,
    94,
    125,
    157,
    159
   ],
   [
    25,
    31,
    61,
    64,
    95,
    126,
    150,
    158
   ],
   [
    26,
    32,
    62,
    65,
    96,
    127,
    151,
    159
   ],
   [
    27,
    33,
    63,
    66,
    97,
    128,
    150,
    152
   ],
   [
    28,
    34,
    64,
    67,
    98,
    129,
    151,
    153
   ],
   [
    29,
    35,
    65,
    68,
    99,
    120,
    152,
    154
   ],
   [
    20,
    36,
    66,
    69,
    90,
    121,
    153,
    155
   ],
   [
    21,
    37,
    60,
    67,
    91,
    122,
    154,
    156
   ],
   [
    32,
    48,
    71,
    78,
    85,
    87,
    102,
    133
   ],
   [
    33,
    49,
    72,
    79,
    86,
    88,
    103,
    134
   ],
   [
    34,
    40,
    70,
    73,
    87,
    89,
    104,
    135
   ],
   [
    35,
    41,
    71,
    74,
    80,
    88,
    105,
    136
   ],
   [
    36,
    42,
    72,
    75,
    81,
    89,
    106,
    137
   ],
   [
    37,
    43,
    73,
    76,
    80,
    82,
    107,
    138
   ],
   [
    38,
    44,
    74,
    77,
    81,
    83,
    108,
    139
   ],
   [
    39,
    45,
    75,
    78,
    82,
    84,
    109,
    130
   ],
   [
    30,
    46,
    76,
    79,
    83,
    85,
    100,
    131
   ],
   [
    31,
    47,
    70,
    77,
    84,
    86,
    101,
    132
   ],
   [
    1,
    8,
    42,
    58,
    95,
    97,
    112,
    143
   ],
   [
    2,
    9,
    43,
    59,
    96,
    98,
    113,
    144
   ],
   [
    0,
    3,
    44,
    50,
    97,
    99,
    114,
    145
   ],
   [
    1,
    4,
    45,
    51,
    90,
    98,
    115,
    146
   ],
   [
    2,
    5,
    46,
    52,
    91,
    99,
    116,
    147
   ],
   [
    3,
    6,
    47,
    53,
    90,
    92,
    117,
    148
   ],
   [
    4,
    7,
    48,
    54,
    91,
    93,
    118,
    149
   ],
   [
    5,
    8,
    49,
    55,
    92,
    94,
    119,
    140
   ],
   [
    6,
    9,
    40,
    56,
    93,
    95,
    110,
    141
   ],
   [
    0,
    7,
    41,
    57,
    94,
    96,
    111,
    142
   ],
   [
    11,
    18,
    52,
    68,
    105,
    107,
    122,
    153
   ],
   [
    12,
    19,
    53,
    69,
    106,
    108,
    123,
    154
   ],
   [
    10,
    13,
    54,
    60,
    107,
    109,
    124,
    155
   ],
   [
    11,
    14,
    55,
    61,
    100,
    108,
    125,
    156
   ],
   [
    12,
    15,
    56,
    62,
    101,
    109,
    126,
    157
   ],
   [
    13,
    16,
    57,
    63,
    100,
    102,
    127,
    158
   ],
   [
    14,
    17,
    58,
    64,
    101,
    103,
    128,
    159
   ],
   [
    15,
    18,
    59,
    65,
    102,
    104,
    129,
    150
   ],
   [
    16,
    19,
    50,
    66,
    103,
    105,
    120,
    151
   ],
   [
    10,
    17,
    51,
    67,
    104,
    106,
    121,
    152
   ],
   [
    21,
    28,
    62,
    78,
    83,
    115,
    117,
    132
   ],
   [
    22,
    29,
    63,
    79,
    84,
    116,
    118,
    133
   ],
   [
    20,
    23,
    64,
    70,
    85,
    117,
    119,
    134
   ],
   [
    21,
    24,
    65,
    71,
    86,
    110,
    118,
    135
   ],
   [
    22,
    25,
    66,
    72,
    87,
    111,
    119,
    136
   ],
   [
    23,
    26,
    67,
    73,
    88,
    110,
    112,
    137
   ],
   [
    24,
    27,
    68,
    74,
    89,
    111,
    113,
    138
   ],
   [
    25,
    28,
    69,
    75,
    80,
    112,
    114,
    139
   ],
   [
    26,
    29,
    60,
    76,
    81,
    113,
    115,
    130
   ],
   [
    20,
    27,
    61,
    77,
    82,
    114,
    116,
    131
   ]
  ]
 },
 "distance": {
  "d": 20,
  "X": {
   "value": 20,
   "confidence": "upper_bound",
   "witness": [
    9,
    17,
    20,
    23,
    39,
    53,
    56,
    59,
    60,
    61,
    64,
    67,
    85,
    100,
    102,
    123,
    130,
    148,
    155,
    157
   ],
   "witness_provenance": {
    "found_by": [
     "@vprusso"
    ],
    "date": "2026-10-30",
    "found_at_samples": 300000000,
    "survived_samples": 300000000,
    "tool": "verify/ris_gpu.py (Perlmutter A100)",
    "seeds": [
     1
    ]
   }
  },
  "Z": {
   "value": 20,
   "confidence": "upper_bound",
   "witness": [
    4,
    5,
    30,
    32,
    35,
    38,
    49,
    51,
    54,
    60,
    66,
    85,
    91,
    92,
    94,
    104,
    143,
    152,
    154,
    159
   ],
   "witness_provenance": {
    "found_by": [
     "@vprusso"
    ],
    "date": "2026-10-30",
    "found_at_samples": 300000000,
    "survived_samples": 300000000,
    "tool": "verify/ris_gpu.py (Perlmutter A100)",
    "seeds": [
     1
    ]
   }
  }
 },
 "provenance": {
  "authors": [
   "@vprusso"
  ],
  "construction": "Bivariate bicycle on Z_8 x Z_10 (n = 2lm = 160) with A = x^7y^7 + x^4y^3 + x^4y^5 + x^2y^8 and B = y^2 + x^5y^2 + x^5y^9 + xy^8, H_X = [A | B], H_Z = [B^T | A^T]; built by research/kit/bb.build_bb(l=8, m=10, A_terms=[[7, 7], [4, 3], [4, 5], [2, 8]], B_terms=[[0, 2], [5, 2], [5, 9], [1, 8]]).",
  "references": [
   "S. Bravyi, A. W. Cross, J. M. Gambetta, D. Maslov, P. Rall, and T. J. Yoder, High-threshold and low-overhead fault-tolerant quantum memory, Nature 627, 778 (2024), arXiv:2308.07915"
  ],
  "date": "2026-10-25",
  "notes": "Unattended loop run on Perlmutter, iteration 810, direction bb-w4-mid, seed 20261827. The deeper rungs recorded in notes/ agree with the gate's reading of d = 20.",
  "model": "Claude Fable 5.1 (Claude Code) working for @vprusso",
  "origin": "submission",
  "search_budget": {
   "candidates_screened": 106817,
   "tool": "research/kit/search.screen_adaptive; verify/heuristic_distance.estimate; verify/ris_gpu.py",
   "notes": "candidates_screened counts direction bb-w4-mid of the loop through 29 October; the loop's 390.6 CPU hours cover all five directions",
   "gpu_hours": 0.34,
   "ris_trials_per_side": 300000000
  }
 },
 "family": "bivariate-bicycle"
}