Result of a job for a list of circuits on QISKit

Question

Suppose Circuits= [circuit1, circuit2, ..., circuitn] is a list of defined circuits. Then, job = execute(Circuits, backend=backend, shots=shots, max_credits=max_credits) will execute a list of circuits all together. Then, one can get the result by using job.result().get_counts. It looks like this (with the results of the first circuit execution highlighted):

Is there any way to extract the counts like how it usually is with only one circuit in execution?

Answer 1

From the Getting started tutorial on Qiskit, it seems that you grab the result of job first and you access the counts via the function get_counts(circuit) for a specific circuit. So I would loop through Circuits and use this function on each:

result_submissions = job.result()
for qc in Circuits:
     counts = result_submissions.get_counts(qc)
     print(counts)

Answer 2

You can still use the get_counts() function:

result = job_exp.result()
result.get_counts(arg)

The key here is that that function takes different arguments: simply an integer representing the index of the circuit on the Circuits list, the circuit object itself, and the circuit.name attribute (I think). You can check this on the documentation.

So even if you have the same circuit several times in the the Circuits list, you can still correctly identify each circuit by using the index referring to its position on the said list.

This goes a bit late, but might still be useful for someone.