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I'm looking for something that performs a conversion such as qiskit.circuit.QuantumCircuit.qasm, but for qasm code. In other words, a means to convert qasm code to qiskit code?

Not just converting from qasm code to a QuantumCircuit object, but yielding the actual qiskit code. The closest method I've found is to paste the qasm code into IBM's circuit composer then copying from there. However, I need to automate the process. Does anyone know about an existing function like this or do I need to write it myself?

Thanks in advance, and I'm new to this site so hopefully I haven't broken any rules! If I have, please let me know.

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  • $\begingroup$ You might want to check out this StackOverflow answer: quantumcomputing.stackexchange.com/questions/29586/… $\endgroup$
    – Frank Yellin
    Jan 6 at 19:28
  • $\begingroup$ Thanks for the link @FrankYellin, seems related yes. $\endgroup$
    – Loqi
    Jan 9 at 13:58
  • $\begingroup$ tbh you could try gpt4 with an API key. Might not get it perfect but will come pretty close $\endgroup$
    – ryanhill1
    Jun 7 at 16:35

1 Answer 1

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The QuantumCircuit's method from_qasm_str takes an OpenQASM 2 definition of a circuit and converts it into a QuantumCircuit Qiskit object:

from qiskit import QuantumCircuit

circuit = QuantumCircuit.from_qasm_str("""
OPENQASM 2.0;
include "qelib1.inc";
qreg q[2];
cz q[0],q[1];
u(2*pi,3*pi,-5*pi) q[0];
""")
circuit.draw('mpl')

Quantum circuit

If the OpenQASM code is in a file, you can use QuantumCircuit.from_qasm_file('filename.qasm').

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    $\begingroup$ Thanks for the answer @luciano. However, I'm looking for a method that converts qasm code into qiskit code such that it can be automated. Not a QuantumCircuit object. But perhaps there is a way to convert a QuantumCircuit object into qiskit code? I'm not sure yet. $\endgroup$
    – Loqi
    Jan 9 at 13:43
  • $\begingroup$ there is now way to do that at the moment. What's the use case for it? $\endgroup$
    – luciano
    Jan 9 at 17:50
  • $\begingroup$ For example using a benchmark set of quantum programs written in qasm, but you want to automatically load them into another backend that reads qiskit code. So just practical things like that. @luciano $\endgroup$
    – Loqi
    Jan 12 at 14:26
  • $\begingroup$ Backends consume Qiskit QuantumCircuit objects. You can do that loading a QASM and send it to run. $\endgroup$
    – luciano
    Jan 12 at 19:34
  • $\begingroup$ For the benchmarks, it may make sense to start from something framework-independent and generate framework-specific circuits from there. $\endgroup$
    – rhundt
    Feb 8 at 1:51

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