35 lines
1.2 KiB
Plaintext
35 lines
1.2 KiB
Plaintext
---
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title: entanglement_of_formation
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description: API reference for qiskit.quantum_info.entanglement_of_formation
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in_page_toc_min_heading_level: 1
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python_api_type: function
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python_api_name: qiskit.quantum_info.entanglement_of_formation
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---
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# qiskit.quantum\_info.entanglement\_of\_formation
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<Function id="qiskit.quantum_info.entanglement_of_formation" isDedicatedPage={true} github="https://github.com/qiskit/qiskit/tree/stable/0.23/qiskit/quantum_info/states/measures.py" signature="entanglement_of_formation(state)">
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Calculate the entanglement of formation of quantum state.
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The input quantum state must be either a bipartite state vector, or a 2-qubit density matrix.
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**Parameters**
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**state** ([*Statevector*](qiskit.quantum_info.Statevector "qiskit.quantum_info.Statevector") *or*[*DensityMatrix*](qiskit.quantum_info.DensityMatrix "qiskit.quantum_info.DensityMatrix")) – a 2-qubit quantum state.
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**Returns**
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The entanglement of formation.
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**Return type**
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float
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**Raises**
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* **QiskitError** – if the input state is not a valid QuantumState.
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* **QiskitError** – if input is not a bipartite QuantumState.
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* **QiskitError** – if density matrix input is not a 2-qubit state.
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</Function>
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