{
  "artifact": "One-qubit channel diagnosis matrix",
  "chapter": "Decoherence and Error Channels",
  "chapter_url": "https://www.steven-geller.com/playground/quantum/book/45-decoherence-and-error-channels/",
  "date_modified": "2026-08-14",
  "dependencies": [],
  "expected_exit_code": 0,
  "expected_stdout": "PASS: 45 channel evidence population=0.410734 coherence=0.116334 long_population=2.671e-15 trace=1.0\n",
  "fixture_sha256": "53a70a59ae966e33778d6c1ed3add5da4f63b3d5e8083b70d5cfe29d406ea466",
  "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 preserve trace/Hermiticity and recover limiting cases at t=0 and long time; each diagnosis row includes units, model assumptions, and at least one discriminating measurement.",
  "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."
}