{
  "artifact": "No-cloning symbolic counterexample",
  "chapter": "No-Cloning and Why Copying Breaks Quantum Logic",
  "chapter_url": "https://www.steven-geller.com/playground/quantum/book/21-no-cloning-and-why-copying-breaks-quantum-logic/",
  "date_modified": "2026-08-14",
  "dependencies": [],
  "expected_exit_code": 0,
  "expected_stdout": "PASS: 21 no-cloning verifier copies 2 orthogonal basis states but gives nonbasis fidelities=[0.5000000000000002, 0.5200000000000004, 0.7123999983771088]; min overlap contradiction=0.122, linearity gap=0.765, measure/reprepare purity=0.500\n",
  "fixture_sha256": "ad4fb34b2644fd9b06a976fb3b879075dd2701ca2ab7b1c6dbe54110d3f05fe3",
  "manifest_test_command": "python3 tools/validate_briefs.py --briefs data/editorial_briefs_00_35.json --from 0 --through 35 --check-rewritten-sources --execute-artifacts",
  "pass_condition": "Tests basis copying, |+> failure, nonzero fidelity gap, and explicitly labels measurement/repreparation as a different channel.",
  "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."
}