---
title: fake_provider (v2.1)
description: API reference for qiskit.providers.fake_provider in qiskit v2.1
source: https://eu-de.quantum.cloud.ibm.com/docs/en/api/qiskit/2.1/providers_fake_provider
---

# Fake Provider

`qiskit.providers.fake_provider`

## Overview

The fake provider module in Qiskit contains fake (simulated) backend classes useful for testing the transpiler and other backend-facing functionality.

### Example Usage

Here is an example of using a simulated backend for transpilation and running.

```python
from qiskit import QuantumCircuit, transpile
from qiskit.providers.fake_provider import GenericBackendV2
from qiskit.visualization import plot_histogram

# Generate a 5-qubit simulated backend
backend = GenericBackendV2(num_qubits=5)

# Create a simple circuit
circuit = QuantumCircuit(3)
circuit.h(0)
circuit.cx(0,1)
circuit.cx(0,2)
circuit.measure_all()
circuit.draw('mpl')

# Transpile the ideal circuit to a circuit that can be directly executed by the backend
transpiled_circuit = transpile(circuit, backend)
transpiled_circuit.draw('mpl')

# Run the transpiled circuit using the simulated backend
job = backend.run(transpiled_circuit)
counts = job.result().get_counts()
plot_histogram(counts)
```

![Output from the previous code.](https://eu-de.quantum.cloud.ibm.com/docs/images/api/qiskit/2.1/providers_fake_provider-1_00.avif)

![Output from the previous code.](https://eu-de.quantum.cloud.ibm.com/docs/images/api/qiskit/2.1/providers_fake_provider-1_01.avif)

![Output from the previous code.](https://eu-de.quantum.cloud.ibm.com/docs/images/api/qiskit/2.1/providers_fake_provider-1_02.avif)

## V2 Simulated Backends

|                                                                                                                                                                                 |                                                                                                                                                     |
| ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------- |
| [`GenericBackendV2`](/docs/api/qiskit/2.1/qiskit.providers.fake_provider.GenericBackendV2 "qiskit.providers.fake_provider.GenericBackendV2")(num\_qubits\[, basis\_gates, ...]) | Generic [`BackendV2`](/docs/api/qiskit/2.1/qiskit.providers.BackendV2 "qiskit.providers.BackendV2") implementation with a configurable constructor. |