Issue handling multiple measurements

[rahula06]

Hi, there seems to be an issue running jobs with multiple measurement gates in them. For instance the circuit in the following code runs well

from qibo_cloud_backends.qiskit_client import QiskitClientBackend
from qibo.models import Circuit 
from qibo import gates

qisk_backend = QiskitClientBackend(token = 'my_token')

d = Circuit(2)
d.add(gates.H(0))
d.add(gates.M(1))

print(qisk_backend.execute_circuit(d).probabilities())

but the circuit in the following code does not

from qibo_cloud_backends.qiskit_client import QiskitClientBackend
from qibo.models import Circuit 
from qibo import gates

qisk_backend = QiskitClientBackend(token = 'my_token')

d = Circuit(2)
d.add(gates.H(0))
d.add(gates.M(1))
d.add(gates.M(0))

print(qisk_backend.execute_circuit(d).probabilities())

yielding the error

 File "/home/q1/.conda/envs/RQibo/lib/python3.11/site-packages/qibo_cloud_backends/qiskit_client.py", line 55, in execute_circuit
    sample = [int(bit) for bit in reversed(state)]
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/q1/.conda/envs/RQibo/lib/python3.11/site-packages/qibo_cloud_backends/qiskit_client.py", line 55, in <listcomp>
    sample = [int(bit) for bit in reversed(state)]
              ^^^^^^^^
ValueError: invalid literal for int() with base 10: ' '

It seems to me that there's no issue with running the circuit, the processing of the result seems to be broken in this case.

@jykhoo1987

[rahula06]

Using gates.M(0,1) instead of adding two measurement gates seems to be a good workaround, as suggested in the weekly meeting. Thanks a lot!

[BrunoLiegiBastonLiegi]

Glad the workaround works, I'll fix this asap thanks for reporting!