Update for Qiskit 1.0

[frankharkins]

Minor tweaks to make this project work with Qiskit 1.0

• execute -> transpile & backend.run
• qiskit.tools.visualization -> qiskit.visualization
• qiskit.extensions.UnitaryGate -> qiskit.circuit.library.UnitaryGate

I couldn't get the test suite working on my machine but I can take a look if anything fails in CI.

[MarquessV]

@frankharkins Thank you for doing this! I approved CI to run on this PR. Looks like tests are failing due to ImportError: cannot import name 'UnitaryGate' from 'qiskit.circuit.library'.

Also, are these changes intended to be compatible with the Qiskit version this library currently supports (>=0.38)? Just want to check if we should update the constraint in pyproject.toml.

[frankharkins]

Hi, sorry I missed this. I've just pushed a commit that should add backwards compatibility for earlier Qiskit versions, so hopefully you won't need to update your dependencies.

[frankharkins]

I'm not sure why the tests failed. QuantumCircuit.qasm has been removed so that will need updating, but that shouldn't have caused the test to fail as it's still using qiskit<=1.0. Unfortunately I can't look at it next week, but feel free to push to my branch or merge to a feature and work on it there. If it's still open I'll take a look when I'm back.

Here's the migration guide I've been using: https://docs.quantum.ibm.com/api/migration-guides/qiskit-1.0-features