✨ Improving the custom squivalences of certain native gatesets #579
Description
Problem Statement
In #560, both the IonQ and the Rigetti gateset were improved to better reflect the actual native gates (while before, an "approximation" of that was used). To this end, custom gates and equivalences were defined. These are added to the SessionEquivalenceLibrary before transpile(...) is called for such targets.
While so far, the necessary equivalences are implemented, it might yield more optimized circuit it further of such equivalences are added.
Proposed Solution
Adding further equivalences to allow Qiskit to yield more optimized compiled circuits.