{
  "artifact": "Bell/GHZ verification harness",
  "chapter": "Bell States and GHZ States",
  "chapter_url": "https://www.steven-geller.com/playground/quantum/book/20-bell-states-and-ghz-states/",
  "date_modified": "2026-08-14",
  "dependencies": [],
  "expected_exit_code": 0,
  "expected_stdout": "PASS: 20 Bell/GHZ harness verifies 4 orthogonal Bell states (max cross-overlap=0.0e+00), GHZ X-even support=4, classical-mixture X anticorrelation=0.500\n",
  "fixture_sha256": "4ae40a10bd646583c39b90e171332def5afb7a03d7b91f6c64ce579f6edc1b90",
  "manifest_test_command": "cd labs && PYTHONPATH=src python -m quantum_end_to_end bell --shots 10000 --seed 7",
  "pass_condition": "Tests all four Bell preparations, GHZ parity in X/Z settings, and rejection of a matched-count classical mixture.",
  "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."
}