31 lines
1014 B
Plaintext
31 lines
1014 B
Plaintext
---
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title: set_density_matrix
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description: API reference for qiskit.providers.aer.library.set_density_matrix
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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.providers.aer.library.set_density_matrix
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---
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# qiskit.providers.aer.library.set\_density\_matrix
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<Function id="qiskit.providers.aer.library.set_density_matrix" isDedicatedPage={true} github="https://github.com/qiskit/qiskit-aer/tree/stable/0.9/qiskit/providers/aer/library/set_instructions/set_density_matrix.py" signature="set_density_matrix(self, state)">
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Set the density matrix state of the simulator.
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**Parameters**
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**state** ([*DensityMatrix*](qiskit.quantum_info.DensityMatrix "qiskit.quantum_info.DensityMatrix")) – a density matrix.
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**Returns**
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with attached instruction.
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**Return type**
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[QuantumCircuit](qiskit.circuit.QuantumCircuit "qiskit.circuit.QuantumCircuit")
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**Raises**
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**ExtensionError** – If the density matrix is the incorrect size for the current circuit.
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</Function>
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