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

# EvolutionBase

*class* `qiskit.opflow.evolutions.EvolutionBase`

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

Bases: [`ConverterBase`](/docs/api/qiskit/0.46/qiskit.opflow.converters.ConverterBase "qiskit.opflow.converters.converter_base.ConverterBase"), [`ABC`](https://docs.python.org/3/library/abc.html#abc.ABC)

Deprecated: A base for Evolution converters. Evolutions are converters which traverse an Operator tree, replacing any `EvolvedOp` e with a Schrodinger equation-style evolution `CircuitOp` equalling or approximating the matrix exponential of -i \* the Operator contained inside (e.primitive). The Evolutions are essentially implementations of Hamiltonian Simulation algorithms, including various methods for Trotterization.

> **Deprecated since version 0.24.0**
>
> The class `qiskit.opflow.evolutions.evolution_base.EvolutionBase` 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

*abstract* `convert(operator)`

Traverse the operator, replacing any `EvolutionOps` with their equivalent evolution `CircuitOps`.

> **Args:**
>
> operator: The Operator to convert.

**Returns**

The converted Operator, with `EvolutionOps` replaced by `CircuitOps`.

**Return type**

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