---
title: MatrixEvolution (v0.46)
description: API reference for qiskit.opflow.evolutions.MatrixEvolution in qiskit v0.46
source: https://eu-de.quantum.cloud.ibm.com/docs/en/api/qiskit/0.46/qiskit.opflow.evolutions.MatrixEvolution
---

# MatrixEvolution

*class* `qiskit.opflow.evolutions.MatrixEvolution`

[GitHub](https://github.com/qiskit/qiskit/tree/stable/0.46/qiskit/opflow/evolutions/matrix_evolution.py)

Bases: [`EvolutionBase`](/docs/api/qiskit/0.46/qiskit.opflow.evolutions.EvolutionBase "qiskit.opflow.evolutions.evolution_base.EvolutionBase")

Deprecated: Performs Evolution by classical matrix exponentiation, constructing a circuit with `UnitaryGates` or `HamiltonianGates` containing the exponentiation of the Operator.

> **Deprecated since version 0.24.0**
>
> The class `qiskit.opflow.evolutions.matrix_evolution.MatrixEvolution` is deprecated as of qiskit-terra 0.24.0. It will be removed in the Qiskit 1.0 release. For code migration guidelines, visit [https://qisk.it/opflow\_migration](https://qisk.it/opflow_migration).

## Methods

### convert

`convert(operator)`

Traverse the operator, replacing `EvolvedOps` with `CircuitOps` containing `UnitaryGates` or `HamiltonianGates` (if self.coeff is a `ParameterExpression`) equalling the exponentiation of -i \* operator. This is done by converting the `EvolvedOp.primitive` to a `MatrixOp` and simply calling `.exp_i()` on that.

**Parameters**

**operator** ([*OperatorBase*](/docs/api/qiskit/0.46/qiskit.opflow.OperatorBase "qiskit.opflow.operator_base.OperatorBase")) – The Operator to convert.

**Returns**

The converted operator.

**Return type**

[*OperatorBase*](/docs/api/qiskit/0.46/qiskit.opflow.OperatorBase "qiskit.opflow.operator_base.OperatorBase")