Pennylane-Qiskit Session Error

PennyLane Plugins PennyLane Qiskit
11

Hi @grier_jones and @hoonjkim ,

It looks like there was an import missing in the plugin which is why this was failing. My colleague Austin found the issue and fixed it in record time! :tada:

You can use it with the development version of the plugin, and install it as follows:

python -m pip install git+https://github.com/PennyLaneAI/pennylane-qiskit.git#egg=pennylane-qiskit

You can then use something like the code below.

import pennylane as qml
from pennylane import numpy as pnp
from qiskit_ibm_runtime import QiskitRuntimeService
from pennylane_qiskit.qiskit_device import qiskit_session
QiskitRuntimeService.save_account(channel="ibm_quantum", token=token, overwrite=True)
# To access saved credentials for the IBM quantum channel and select an instance
service = QiskitRuntimeService(channel="ibm_quantum")
backend = service.backend(name= 'ibm_sherbrooke')
dev = qml.device(
    "qiskit.remote",
    wires=127,
    backend=backend,
    resilience_level=1,
    optimization_level=1,
    seed_transpiler=42
)

with qiskit_session(dev,max_time='2h') as session:
    print(session.details())

    # Add your code here
    
    @qml.qnode(dev)
    def circuit(theta):
      qml.RX(theta,wires=0)
      return qml.expval(qml.PauliZ(0))
    
    opt = qml.GradientDescentOptimizer(stepsize=0.3)
    
    theta = pnp.array(0.5)
    for i in range(10):
      theta = opt.step(circuit,theta)
      print('theta: ', theta, 'circuit: ', circuit(theta))

Note that resilience_level is only available in Qiskit’s Estimator but not in Sampler so if you’re using qml.expval() or qml.probs() this will work for you, but if you’re using other measurements you’ll need to remove this argument.

Thanks both for making us aware of this issue.

Let us know if the fix works for you.

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