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  "X": {
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   "confidence": "upper_bound",
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   "confidence": "upper_bound",
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 "provenance": {
  "authors": [
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  "construction": "SAT search (research/local_sat.py build_local_cnf with the grid site list repeated 2 times, n_side=6, G=17, max_weight=8, t=2 detection, anchor radius 3.5, shared_t3 encoding, CaDiCaL 1.9.5 via python-sat) over bilayer 2D-local CSS codes: 2 qubits per site of a 6x6 grid (layers=2), each check anchored at a grid site and acting within radius 3.5 of it, so the interaction radius is at most 7.0 by construction. Model index 0 of the enumeration; distance is a witness-backed upper bound.",
  "references": [],
  "date": "2026-09-26",
  "notes": "Phase 2 (bilayer) of the 2D-local SAT t=2+ campaign (issue #2024); instance b6_G17_w8_t2. Distance is an upper bound from the kit's RIS witness search at 20000 trials per side.",
  "model": "Claude Fable 5.1 (Claude Code)"
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