HalfAngle Error: 'Instruction y is not supported'

[JustinTHou]

Informations

• Qiskit Experiments version: 0.5.3
• Python version: 3.11.3
• Operating system:

What is the current behavior?

Running HalfAngle reports error message 'Instruction y is not supported.'

HalfAngle sets y as one of the basis gates which is not in the backend's default basis.
If we override HalfAngle's basis gates to the backend's default set, then the transpiler can convert the y gates into sx-sx which will make the experiment not test what it is supposed to test.

Steps to reproduce the problem

Tested on maple staging backend and ibmq_quito backend, both with basis gate set ['cx', 'id', 'rz', 'sx', 'x']. The same error messages are shown.

What is the expected behavior?

The HalfAngle experiment runs normally with default basis gate set in ['cx', 'id', 'rz', 'sx', 'x'].

Suggested solutions

[coruscating]

Addressed by #1259.