I have been trying to run two circuits in the ibmq_london device, the one resulting of applying one X gate on qubit $0$ and the one that applies two X gates. I know that applying two X gates is the same as doing nothing because of its properties, but I am interested in the study of noise so I really want Qiskit to apply both gates. I have tried to place a barrier between both X gates but it does not seem to be working because I obtain the following results:
I have tried to write the following code:
job_device = execute(qc, device,shots=8192,basis_gates=None,optimization_level=0)
for the execution, but it does not seem to be working as due to the effect of noise I will expect a lower value for the XX circuit (two gates applied), even taking into account the thermal relaxation.