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 },
 "distance": {
  "d": 17,
  "X": {
   "value": 17,
   "confidence": "upper_bound",
   "witness": [
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   ],
   "witness_provenance": {
    "found_by": [
     "@vprusso"
    ],
    "date": "2026-10-07",
    "found_at_samples": 10000000,
    "tool": "accelerated RIS (research/kit distance_rand_witness), pair depth 32",
    "seeds": [
     41
    ]
   }
  },
  "Z": {
   "value": 17,
   "confidence": "upper_bound",
   "witness": [
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   ],
   "witness_provenance": {
    "found_by": [
     "@vprusso"
    ],
    "date": "2026-10-07",
    "found_at_samples": 10000000,
    "tool": "accelerated RIS (research/kit distance_rand_witness), pair depth 32",
    "seeds": [
     41
    ]
   }
  }
 },
 "provenance": {
  "authors": [
   "@vprusso"
  ],
  "origin": "baseline",
  "novelty": "known_parameters",
  "model": "human",
  "construction": "Routing code of Zhang, Chen, Duan, Li, Wei, Hou, Kong, Wu and Guo (arXiv:2606.25330, Table 4) on the torus Z_40 x Z_10, routing sequence v = (1,0),(0,1),(1,0),(1,0),(6,1),(6,1),(6,1),(1,0),(1,0),(0,1),(1,0) and w the time reversal of v. Data qubits at sites (i, j) with i + j even (200 of 400 sites, indexed in row-major order of (i, j)); X syndromes at i odd, j even; Z syndromes at i even, j odd. At step t every X syndrome at r swaps with the data qubit at r + v_t and every Z syndrome with the data qubit at r + w_t (positions mod (40, 10)); a syndrome's check is the set of data qubits it swapped with over the 11 steps, so every check has weight 11. The translation (i, j) -> (i + 1, j + 1) maps the X checks onto the Z checks, so d_X = d_Z and the Z witness is the image of the X witness. Rebuilt from the paper's rule; the paper publishes no matrices.",
  "references": [
   "arXiv:2606.25330"
  ],
  "date": "2026-10-07",
  "notes": "Literature reconstruction for the board-filling campaign of issue #2863 (item L2). The paper states d = 17. Readings here: 200,000 trials 17; 2,000,000 trials 17; 10,000,000 trials 17 (X logical, seed 41). Witnessed upper bound, not certified. The paper's other weight-11 instance [[200,24,14]] rebuilds the same way and reads 14 at 10,000,000 trials but is dominated by the board's [[170,32,14]]; its eight weight-7 instances all rebuild to their stated parameters and are dominated at check weight 7."
 },
 "family": "other"
}