Hi,
You have demos on how to use IBMQ via Pennylane:
- Using PennyLane with IBM’s quantum devices and Qiskit
- IBM Q Experience
And Discussion VQE with ibmq machine
If you have an error in the device about your account already exist you need to create a provider object and pass it to the divide. Like this:
from qiskit_ibm_runtime import QiskitRuntimeService
# For an IBM Cloud account.
ibm_cloud_service = QiskitRuntimeService(channel="ibm_cloud", token="MY_IBM_CLOUD_API_KEY", instance="MY_IBM_CLOUD_CRN")
# For an IBM Quantum account.
ibm_quantum_service = QiskitRuntimeService(channel="ibm_quantum", token="MY_IBM_QUANTUM_TOKEN")
Best