qiskit-documentation/docs/api/qiskit/0.43/qiskit.opflow.commutator.mdx

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---
title: commutator
description: API reference for qiskit.opflow.commutator
in_page_toc_min_heading_level: 1
python_api_type: function
python_api_name: qiskit.opflow.commutator
---
<span id="qiskit-opflow-commutator" />
# qiskit.opflow\.commutator
<Function id="qiskit.opflow.commutator" isDedicatedPage={true} github="https://github.com/qiskit/qiskit/tree/stable/0.24/qiskit/opflow/utils.py" signature="commutator(op_a, op_b)">
Deprecated: Compute commutator of op\_a and op\_b.
$$
AB - BA.
$$
<Admonition title="Deprecated since version 0.24.0" type="danger">
The function `qiskit.opflow.utils.commutator()` is deprecated as of qiskit-terra 0.24.0. It will be removed no earlier than 3 months after the release date. For code migration guidelines, visit [https://qisk.it/opflow\_migration](https://qisk.it/opflow_migration).
</Admonition>
**Parameters**
* **op\_a** ([*OperatorBase*](qiskit.opflow.OperatorBase "qiskit.opflow.operator_base.OperatorBase")) Operator A
* **op\_b** ([*OperatorBase*](qiskit.opflow.OperatorBase "qiskit.opflow.operator_base.OperatorBase")) Operator B
**Returns**
the commutator
**Return type**
[OperatorBase](qiskit.opflow.OperatorBase "qiskit.opflow.OperatorBase")
</Function>