--- title: fake_provider (v1.2) description: API reference for qiskit.providers.fake_provider in qiskit v1.2 source: https://eu-de.quantum.cloud.ibm.com/docs/en/api/qiskit/1.2/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) ``` ![../\_images/providers\_fake\_provider-1\_00.png](https://eu-de.quantum.cloud.ibm.com/docs/images/api/qiskit/1.2/providers_fake_provider-1_00.avif) ![../\_images/providers\_fake\_provider-1\_01.png](https://eu-de.quantum.cloud.ibm.com/docs/images/api/qiskit/1.2/providers_fake_provider-1_01.avif) ![../\_images/providers\_fake\_provider-1\_02.png](https://eu-de.quantum.cloud.ibm.com/docs/images/api/qiskit/1.2/providers_fake_provider-1_02.avif) ## V2 Simulated Backends | | | | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------- | | [`GenericBackendV2`](/docs/api/qiskit/1.2/qiskit.providers.fake_provider.GenericBackendV2 "qiskit.providers.fake_provider.GenericBackendV2")(num\_qubits\[, basis\_gates, ...]) | Generic [`BackendV2`](/docs/api/qiskit/1.2/qiskit.providers.BackendV2 "qiskit.providers.BackendV2") implementation with a configurable constructor. | ## V1 Fake Backends (Legacy interface) | | | | ------------------------------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------ | | [`FakeOpenPulse2Q`](/docs/api/qiskit/1.2/qiskit.providers.fake_provider.FakeOpenPulse2Q "qiskit.providers.fake_provider.FakeOpenPulse2Q")() | A fake 2 qubit backend for pulse test. | | [`FakeOpenPulse3Q`](/docs/api/qiskit/1.2/qiskit.providers.fake_provider.FakeOpenPulse3Q "qiskit.providers.fake_provider.FakeOpenPulse3Q")() | Trivial extension of the FakeOpenPulse2Q. | | [`Fake1Q`](/docs/api/qiskit/1.2/qiskit.providers.fake_provider.Fake1Q "qiskit.providers.fake_provider.Fake1Q")() | A fake 1Q backend. | | [`Fake5QV1`](/docs/api/qiskit/1.2/qiskit.providers.fake_provider.Fake5QV1 "qiskit.providers.fake_provider.Fake5QV1")() | A fake backend with the following characteristics: | | [`Fake20QV1`](/docs/api/qiskit/1.2/qiskit.providers.fake_provider.Fake20QV1 "qiskit.providers.fake_provider.Fake20QV1")() | A fake backend with the following characteristics: | | [`Fake7QPulseV1`](/docs/api/qiskit/1.2/qiskit.providers.fake_provider.Fake7QPulseV1 "qiskit.providers.fake_provider.Fake7QPulseV1")() | A fake **pulse** backend with the following characteristics: | | [`Fake27QPulseV1`](/docs/api/qiskit/1.2/qiskit.providers.fake_provider.Fake27QPulseV1 "qiskit.providers.fake_provider.Fake27QPulseV1")() | A fake **pulse** backend with the following characteristics: | | [`Fake127QPulseV1`](/docs/api/qiskit/1.2/qiskit.providers.fake_provider.Fake127QPulseV1 "qiskit.providers.fake_provider.Fake127QPulseV1")() | A fake **pulse** backend with the following characteristics: | ## Fake Backend Base Classes The V1 fake backends are based on a set of base classes: ### FakeBackend *class* `qiskit.providers.fake_provider.FakeBackend(configuration, time_alive=10)` [GitHub](https://github.com/Qiskit/qiskit/tree/stable/1.2/qiskit/providers/fake_provider/fake_backend.py#L39-L165) This is a dummy backend just for testing purposes. FakeBackend initializer. > **Deprecated since version 1.2** > > The class `qiskit.providers.fake_provider.fake_backend.FakeBackend` is deprecated as of qiskit 1.2. It will be removed in the 2.0 release. Fake backends using BackendV1 are deprecated in favor of [`GenericBackendV2`](/docs/api/qiskit/1.2/qiskit.providers.fake_provider.GenericBackendV2 "qiskit.providers.fake_provider.GenericBackendV2"). You can convert BackendV1 to [`BackendV2`](/docs/api/qiskit/1.2/qiskit.providers.BackendV2 "qiskit.providers.BackendV2") with [`BackendV2Converter`](/docs/api/qiskit/1.2/qiskit.providers.BackendV2Converter "qiskit.providers.BackendV2Converter"). **Parameters** - **configuration** ([*BackendConfiguration*](/docs/api/qiskit/1.2/qiskit.providers.models.BackendConfiguration "qiskit.providers.models.BackendConfiguration")) – backend configuration - **time\_alive** ([*int*](https://docs.python.org/3/library/functions.html#int)) – time to wait before returning result ### FakeQasmBackend *class* `qiskit.providers.fake_provider.FakeQasmBackend` [GitHub](https://github.com/Qiskit/qiskit/tree/stable/1.2/qiskit/providers/fake_provider/fake_qasm_backend.py#L32-L77) A fake OpenQASM backend. FakeBackend initializer. > **Deprecated since version 1.2** > > The class `qiskit.providers.fake_provider.fake_backend.FakeBackend` is deprecated as of qiskit 1.2. It will be removed in the 2.0 release. Fake backends using BackendV1 are deprecated in favor of [`GenericBackendV2`](/docs/api/qiskit/1.2/qiskit.providers.fake_provider.GenericBackendV2 "qiskit.providers.fake_provider.GenericBackendV2"). You can convert BackendV1 to [`BackendV2`](/docs/api/qiskit/1.2/qiskit.providers.BackendV2 "qiskit.providers.BackendV2") with [`BackendV2Converter`](/docs/api/qiskit/1.2/qiskit.providers.BackendV2Converter "qiskit.providers.BackendV2Converter"). **Parameters** - **configuration** ([*BackendConfiguration*](/docs/api/qiskit/1.2/qiskit.providers.models.BackendConfiguration "qiskit.providers.models.BackendConfiguration")) – backend configuration - **time\_alive** ([*int*](https://docs.python.org/3/library/functions.html#int)) – time to wait before returning result ### FakePulseBackend *class* `qiskit.providers.fake_provider.FakePulseBackend` [GitHub](https://github.com/Qiskit/qiskit/tree/stable/1.2/qiskit/providers/fake_provider/fake_pulse_backend.py#L25-L44) A fake pulse backend. FakeBackend initializer. > **Deprecated since version 1.2** > > The class `qiskit.providers.fake_provider.fake_backend.FakeBackend` is deprecated as of qiskit 1.2. It will be removed in the 2.0 release. Fake backends using BackendV1 are deprecated in favor of [`GenericBackendV2`](/docs/api/qiskit/1.2/qiskit.providers.fake_provider.GenericBackendV2 "qiskit.providers.fake_provider.GenericBackendV2"). You can convert BackendV1 to [`BackendV2`](/docs/api/qiskit/1.2/qiskit.providers.BackendV2 "qiskit.providers.BackendV2") with [`BackendV2Converter`](/docs/api/qiskit/1.2/qiskit.providers.BackendV2Converter "qiskit.providers.BackendV2Converter"). **Parameters** - **configuration** ([*BackendConfiguration*](/docs/api/qiskit/1.2/qiskit.providers.models.BackendConfiguration "qiskit.providers.models.BackendConfiguration")) – backend configuration - **time\_alive** ([*int*](https://docs.python.org/3/library/functions.html#int)) – time to wait before returning result