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 "schema_version": "0.2",
 "name": "[[40,6,4]], 2D-local bilayer layout",
 "code_type": "CSS",
 "n": 40,
 "k": 6,
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 "distance": {
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   "confidence": "upper_bound",
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 "provenance": {
  "authors": [
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  "construction": "Reconstructed from qecdb.org record 67a4b09939376ce8055b7d02 (DB family: hyperbolic_2d); H-field X/Z row split, k recomputed, witnesses from the kit's random search.",
  "origin": "submission",
  "date": "2026-08-15",
  "model": "DeepSeek V4 Flash 0731",
  "notes": " LAYOUT added 2026-08-20: a 1-layer planar layout with measured interaction radius 5.3852 (integer-grid sites, min site spacing 1.0, at most 1 qubits per site), placing the code in the local-2d-bilayer class with geometric efficiency g = 0.0114. Layout credit and method are recorded in locality.contributed_by; the code, its distance claims, and its authorship are unchanged. Part of the layout-filling effort (issue #654 discussion)."
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  "contributed_by": {
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   "date": "2026-08-20",
   "method": "Tier-0/1 pipeline: spectral (Laplacian eigenvector) initialization snapped to an integer grid, then simulated annealing over site assignments (single-qubit relocations + pair swaps, max-diameter objective, 2 seeds per layer option). Search driven by Claude Fable 5."
  }
 }
}