Is there a way to use a fake backend for ibm_brisbane?

Question

Is there a way to use a fake backend for ibm_brisbane?

I tried this but it is giving me the error that the backend is not present:

provider = FakeProvider()
backend = provider.get_backend('fake_brisbane')

Tried some of the suggestions from the below, but faced different issues with each:

---

Solution 1:

backend = provider.get_backend('ibm_brisbane')
backend_sim = qiskit_dynamics.DynamicsBackend.from_backend(backend, subsystem_list=[0,1,2,3])

from qiskit import transpile

circ = transpile(circuit, backend_sim)
job = backend_sim.run(circuit, shots=4096, seed_simulator=12345)

Problem:

TranspilerError: "Unable to translate the operations in the circuit: ['sx', 'measure', 'barrier', 'rz'] to the backend's (or manually specified) target basis: ['barrier', 'snapshot', 'measure']. This likely means the target basis is not universal or there are additional equivalence rules needed in the EquivalenceLibrary being used. For more details on this error see: https://qiskit.org/documentation/stubs/qiskit.transpiler.passes.BasisTranslator.html#translation_errors"

---

Solution 2:

#Get the backend
backend = provider.get_backend('ibm_brisbane')

# transpile to backend
circ = transpile(circuit, backend=backend)

# create a simulator for backend
sim = AerSimulator().from_backend(backend)

# simulate and extract results
simulator_result = sim.run(circ).result()
simulator_counts = simulator_result.get_counts()
simulator_counts

Problem:

File c:\Users\Admin\.conda\envs\simuq\lib\site-packages\qiskit\transpiler\passmanager.py:553, in _replace_error.<locals>.wrapper(*meth_args, **meth_kwargs)
    551     return meth(*meth_args, **meth_kwargs)
    552 except PassManagerError as ex:
--> 553     raise TranspilerError(ex.message) from ex

TranspilerError: 'The input circuit None is not scheduled. Call one of scheduling passes before running the ConstrainedReschedule pass.'

Note: I verified that the circ object is not None and it has a valid list of 5 circuits

Answer 1

Here is an example of a bell state simulated experiment for an ibm_brisbane backend:

from qiskit import QuantumCircuit, transpile
from qiskit_aer import AerSimulator
from qiskit_ibm_provider import IBMProvider

# get backend
provider = IBMProvider()
backend = provider.backends(name="ibm_brisbane")[0]

# create a bell circuit
circuit = QuantumCircuit(2, 2)
circuit.h(0)
circuit.cx(0, 1)
circuit.measure([0, 1], [0, 1])
circuit.draw()

# transpile to backend
circ = transpile(circuit, backend=backend)

# create a simulator for backend
sim = AerSimulator().from_backend(backend)

# simulate and extract results
simulator_result = sim.run(circ).result()
simulator_counts = simulator_result.get_counts()
simulator_counts

the results would look something like

{'01': 23, '10': 27, '11': 468, '00': 506}

Using

qiskit                   1.0.1
qiskit-aer               0.13.3
qiskit-ibm-provider      0.10.0

Answer 2

import qiskit_dynamics
import qiskit_ibm_provider
provider = qiskit_ibm_provider.IBMProvider()
print(provider.backends())
backend = provider.get_backend('ibm_brisbane')
backend_sim = qiskit_dynamics.DynamicsBackend.from_backend(backend, subsystem_list=[0, 1])

Here is a way to simulate circuits on 'fake_brisbane', while the subsystem_list is specified due to the qubits you want to use.

Answer 3

You can simply import from qiskit_ibm_runtime.fakeprov as following:

from qiskit_ibm_runtime.fake_provider import FakeBrisbane

backend = FakeBrisbane()
print(backend.name)

This works with qiskit_ibm_runtime version 0.22.0.