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

# QDrift

*class* `qiskit.opflow.evolutions.QDrift(reps=1)`

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

Bases: [`TrotterizationBase`](/docs/api/qiskit/0.46/qiskit.opflow.evolutions.TrotterizationBase "qiskit.opflow.evolutions.trotterizations.trotterization_base.TrotterizationBase")

Deprecated: The QDrift Trotterization method, which selects each each term in the Trotterization randomly, with a probability proportional to its weight. Based on the work of Earl Campbell in [https://arxiv.org/abs/1811.08017](https://arxiv.org/abs/1811.08017).

> **Deprecated since version 0.24.0**
>
> The class `qiskit.opflow.evolutions.trotterizations.qdrift.QDrift` 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).

**Parameters**

**reps** ([*int*](https://docs.python.org/3/library/functions.html#int)) – The number of times to repeat the Trotterization circuit.

## Attributes

### reps

The number of repetitions to use in the Trotterization, improving the approximation accuracy.

## Methods

### convert

`convert(operator)`

Convert a `SummedOp` into a `ComposedOp` or `CircuitOp` representing an approximation of e^-i\*\`\`op\_sum\`\`.

**Parameters**

**operator** ([*OperatorBase*](/docs/api/qiskit/0.46/qiskit.opflow.OperatorBase "qiskit.opflow.operator_base.OperatorBase")) – The `SummedOp` to evolve.

**Returns**

The Operator approximating op\_sum’s evolution.

**Raises**

[**TypeError**](https://docs.python.org/3/library/exceptions.html#TypeError) – A non-SummedOps Operator is passed into `convert`.

**Return type**

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