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---
title: coherent_unitary_error (v0.31)
description: API reference for qiskit.providers.aer.noise.coherent_unitary_error in qiskit v0.31
in_page_toc_min_heading_level: 1
python_api_type: function
python_api_name: qiskit.providers.aer.noise.coherent_unitary_error
---
<span id="qiskit-providers-aer-noise-coherent-unitary-error" />
# qiskit.providers.aer.noise.coherent\_unitary\_error
<Function id="qiskit.providers.aer.noise.coherent_unitary_error" isDedicatedPage={true} github="https://github.com/qiskit/qiskit-aer/tree/stable/0.9/qiskit/providers/aer/noise/errors/standard_errors.py" signature="coherent_unitary_error(unitary)">
Return a coherent unitary quantum error channel.
**Parameters**
**unitary** (*matrix like*) unitary error matrix.
**Returns**
The quantum error object.
**Return type**
[QuantumError](qiskit.providers.aer.noise.QuantumError "qiskit.providers.aer.noise.QuantumError")
</Function>