metadata.json

{
  "id": "quantum-teledata",
  "name": "Entanglement Swapping",
  "category": "fundamentals",
  "description": "Create entanglement between two qubits (q[0] and q[3]) that never directly interact, via entanglement swapping.",
  "long_description": "Entanglement swapping extends entanglement over long distances without direct interaction. Two Bell pairs are created: (q[0],q[1]) and (q[2],q[3]). A Bell measurement on q[1] and q[2] (held by an intermediate node) projects q[0] and q[3] into an entangled Bell state, even though they never interacted. Classical communication of the measurement result allows the receiver to apply corrections. This is the basis of quantum repeaters.",
  "difficulty": "intermediate",
  "qubit_count": 4,
  "clbit_count": 4,
  "gate_count": 10,
  "depth": 8,
  "tags": [
    "entanglement-swapping",
    "quantum-repeater",
    "bell-measurement",
    "fundamentals"
  ],
  "circuit_formats": [
    "qasm2"
  ],
  "source_file": "circuit.qasm",
  "expected_output": "q[0] and q[3] in a Bell state; measurement outcomes correlated",
  "references": [
    {
      "title": "\u017bukowski et al. (1993). Event-ready-detectors Bell experiment via entanglement swapping. PRL 71, 4287",
      "url": "https://doi.org/10.1103/PhysRevLett.71.4287"
    }
  ],
  "author": "OpenQC Community",
  "license": "MIT",
  "version": "1.0.0"
}