{
  "artifact": "Surface-code threshold and overhead sensitivity plot",
  "chapter": "Surface Codes and Threshold Intuition",
  "chapter_url": "https://www.steven-geller.com/playground/quantum/book/49-surface-codes-and-threshold-intuition/",
  "date_modified": "2026-08-14",
  "dependencies": [],
  "expected_exit_code": 0,
  "expected_stdout": "PASS: 49 threshold evidence below=[0.0010000000000000002, 0.00010000000000000003, 1.0000000000000003e-05] above=[0.4, 0.8, 1.6] qubits=[17, 49, 97] input=22d3f4580b\n",
  "fixture_sha256": "76ee573648a3711aa7c4d11c2ef00fb5e3e0affdec3b48e4c11f9678b2f6a21c",
  "manifest_test_command": "python3 tools/validate_briefs.py --briefs data/editorial_briefs_36_63.json --from 36 --through 63 --check-rewritten-sources --execute-artifacts",
  "pass_condition": "Tests require logical error to decrease with odd distance only for p_phys<p_th, reject invalid distances, and validate physical-qubit scaling and input hashes.",
  "python_requires": ">=3.11",
  "run_command": "python3 fixture.py",
  "schema_version": "1.1.0",
  "test_method": "Run the isolated fixture; require exit code 0 and exact stdout."
}