PEC using Mitiq

[Julie-Maria-Raju]

I was trying error mitigation with PEC my idea is to classify an image with a quantum circuit followed by a classical FC.
I need to measure expectation value of each qubit and want to get the pec values for each qubit but when I use observable I can only use ("ZZ") ie as tensor product of expectation values. Is there any way to find expectation values of each qubit and get pec values for each qubit.

observable = Observable(PauliString("XZ"), PauliString("YY")).matrix()

ideal simulator

def ideal_execute(circuit):
    """Simulate (training) circuits without noise"""
    circuit_copy = circuit.copy()
    noise_model = initialized_depolarizing_noise(0.0)
    return execute_with_noise(circuit_copy, observable, noise_model)

I want to define observable different than above to get each qubits expectation value.

[natestemen]

Cool use case! I hope error mitigation will be helpful here.

Can you create an observable using the support keyword argument like this?

obs = Observable(PauliString("Z", support=(i,)) for i in range(num_qubits))

This will mean each PauliString will only act on the qubit i. More details in the mitiq.PauliString API-doc.