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 "provenance": {
  "authors": [
   "@vprusso"
  ],
  "origin": "submission",
  "construction": "search",
  "date": "2026-10-13",
  "references": [
   "arXiv:2609.30069"
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  "notes": "Halved CPM pair-partition code of arXiv:2609.30069 (Definition 1, reversing fold of Proposition 4) at (J,L)=(4,10), lift P=19. Exponent array E (rows a=0..3, columns l=0..9): [[7, 8, 0, 14, 7, 10, 7, 9, 17, 7], [18, 8, 15, 15, 16, 16, 2, 16, 3, 13], [13, 3, 15, 16, 5, 14, 6, 0, 9, 9], [18, 9, 13, 7, 12, 9, 10, 1, 12, 5]]. Off-diagonal pair partitions M: {\"0,1\": [[0, 2], [1, 5], [3, 9], [4, 6], [7, 8]], \"0,2\": [[0, 3], [1, 4], [2, 9], [5, 7], [6, 8]], \"0,3\": [[0, 4], [1, 2], [3, 6], [5, 8], [7, 9]], \"1,2\": [[0, 5], [1, 6], [2, 8], [3, 4], [7, 9]], \"1,3\": [[0, 8], [1, 7], [2, 6], [3, 5], [4, 9]], \"2,3\": [[0, 2], [1, 9], [3, 7], [4, 8], [5, 6]]}. The paper publishes no generators for its halved instances; this code is from a random search over the template. Distance 11 is the lightest logical found in 1000000 refutation trials (upper bound). The paper's table lists [[95,22,12]] for this P, which this search did not reach.",
  "search_budget": {
   "candidates_screened": 158,
   "ris_trials_per_side": 852000000,
   "tool": "halved_pp.py templates; verify/heuristic_distance.py Pauli RIS; gf2_fast on the symplectic doubling under random per-qubit symplectic frames (frame_screen.py)",
   "notes": "Pauli-weight RIS screen, then 852 random per-qubit symplectic frames x 1,000,000 gf2_fast trials on the doubling (Perlmutter job 59676168, 2026-10-11). Lightest Pauli-weight logical found: 11; no frame found lighter. Upper bound only."
  },
  "model": "Claude Fable 5.1"
 }
}