Comparing the Qiskit Aer simulator with an IBM quantum computer

In this recipe, we will create a long quantum circuit that swaps a state between two qubits. You will see that the circuit provides perfect results on your local Qiskit Aer simulator but not quite so perfect results on an actual IBM Quantum® machine.

Getting ready

The sample code for this recipe can be found here: https://github.com/PacktPublishing/Quantum-Computing-in-Practice-with-Qiskit-and-IBM-Quantum-Experience/blob/master/Chapter07/ch7_r2_ootb.py.

How to do it...

Here's the code, stored in the ch7_r2_ootb.py file:

1. As always, start by importing the required classes and methods and load your account:

   # Import Qiskit
   from qiskit import QuantumCircuit
   from qiskit import Aer, IBMQ, execute
   # Import visualization tools
   from qiskit.tools.visualization import plot_histogram
   from qiskit.tools.monitor import job_monitor
   # Load account
   if not IBMQ.active_account():
       IBMQ...