39 lines
2.1 KiB
Plaintext
39 lines
2.1 KiB
Plaintext
---
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title: approximate_noise_model
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description: API reference for qiskit_aer.utils.approximate_noise_model
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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_aer.utils.approximate_noise_model
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---
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# qiskit\_aer.utils.approximate\_noise\_model
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<Function id="qiskit_aer.utils.approximate_noise_model" isDedicatedPage={true} github="https://github.com/qiskit/qiskit-aer/tree/stable/0.11/qiskit_aer/utils/noise_transformation.py" signature="approximate_noise_model(model, *, operator_string=None, operator_dict=None, operator_list=None)">
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Replace all noises in a noise model with ones approximated by a mixture of operators (channels).
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**Parameters**
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* **model** ([*NoiseModel*](qiskit_aer.noise.NoiseModel "qiskit_aer.noise.NoiseModel")) – the noise model to be approximated. All noises in the model must be 1- or 2-qubit noises.
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* **operator\_string** (*string*) – a name for a pre-made set of building blocks for the output channel (Default: None). Possible values are `'pauli'`, `'reset'`, `'clifford'`.
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* **operator\_dict** (*dict*) – a dictionary whose values are the building blocks for the output channel (Default: None). E.g. \{“x”: XGate(), “y”: YGate()}, keys “x” and “y” are not used in transformation.
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* **operator\_list** (*list*) – list of building block operators for the output channel (Default: None). E.g. \[XGate(), YGate()]
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**Returns**
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the approximate noise model.
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**Return type**
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[NoiseModel](qiskit_aer.noise.NoiseModel "qiskit_aer.noise.NoiseModel")
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**Raises**
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* **NoiseError** – if any invalid argument is specified or approximation failed.
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* **MissingOptionalLibraryError** – if cvxpy is not installed.
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<Admonition title="Note" type="note">
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The operator input precedence is: `list` \< `dict` \< `string`. If a `string` is given, `dict` is overwritten; if a `dict` is given, `list` is overwritten. The `string` supports only 1- or 2-qubit errors and its possible values are `'pauli'`, `'reset'`, `'clifford'`. The `'clifford'` does not support 2-qubit errors.
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</Admonition>
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</Function>
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