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---
title: anti_commutator
description: API reference for qiskit.quantum_info.anti_commutator
in_page_toc_min_heading_level: 1
python_api_type: function
python_api_name: qiskit.quantum_info.anti_commutator
---
<span id="qiskit-quantum-info-anti-commutator" />
# qiskit.quantum\_info.anti\_commutator
<Function id="qiskit.quantum_info.anti_commutator" isDedicatedPage={true} github="https://github.com/qiskit/qiskit/tree/stable/0.24/qiskit/quantum_info/operators/utils/anti_commutator.py" signature="anti_commutator(a, b)">
Compute anti-commutator of a and b.
$$
ab + ba.
$$
**Parameters**
* **a** (*OperatorTypeT*) Operator a.
* **b** (*OperatorTypeT*) Operator b.
**Returns**
The anti-commutator
**Return type**
*OperatorTypeT*
</Function>