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I'm just getting started with OpenQASM, but I'm feeling a bit confused. Is there a way to run the .qasm file I've written in Qiskit (i.e. in Python), or is OpenQasm only meant to be used within the IBM Quantum experience?

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You can use qasm files to create a quantum circuit, two ways : via the methods from_qasm_str or from_qasm_file on a QuantumCircuit. See the documentation about this. For example :

test = ''' OPENQASM 2.0;
include "qelib1.inc";

qreg q[2];
creg c[2];

h q[0];
cx q[0],q[1];
'''
from qiskit import QuantumCircuit
qc = QuantumCircuit.from_qasm_str(test)

This will create a QuantumCircuit from the str test. The same syntax work with the other method, just replace test with the path to the qasm file.

Hope this helps! :)

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  • $\begingroup$ Thank you so much! That appears to have worked. I do have another question though. How would I go about getting the state from this QuantumCircuit object? I've tried save_state() but that throws an error. Do I have to then run this on a simulator (such as aer) to be able to retrieve the state? Maybe this ought to be a separate post $\endgroup$
    – stare100
    Aug 18 at 1:49
  • $\begingroup$ You can find the answer in this tutorial :) $\endgroup$
    – Lena
    Aug 18 at 7:39

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