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qiskit.quantum_info.entanglement_of_formation

entanglement_of_formation(state)[source]

Calculate the entanglement of formation of quantum state.

The input quantum state must be either a bipartite state vector, or a 2-qubit density matrix.

Parameters

state (Statevector or DensityMatrix) – a 2-qubit quantum state.

Returns

The entanglement of formation.

Return type

float

Raises
  • QiskitError – if the input state is not a valid QuantumState.

  • QiskitError – if input is not a bipartite QuantumState.

  • QiskitError – if density matrix input is not a 2-qubit state.

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