Use the U gate to translate Qiskit U-like gates

[jcjaskula-aws]

Summary

Replace Us decomposition by the application of a the Braket U gate.

Details and comments

Since U has been added to the Braket SDK, we simplify the implementation here.

Bump qiskit-terra version to solve an occurence of Qiskit/qiskit#7326

[ajberdy]

Approving to merge post 3.8 deprecation

[speller26]

I think this is actually still worth finishing without waiting for the service; the service doesn't support the U gate, but the same goes for control modifiers, which are supported in the provider.

[jcjaskula-aws]

I think this is actually still worth finishing without waiting for the service; the service doesn't support the U gate, but the same goes for control modifiers, which are supported in the provider.

I'm not sure the service handles more gracefully U gates than control modifiers. We could try and fix it if it is a real issue.

[speller26]

I'm not sure the service handles more gracefully U gates than control modifiers. We could try and fix it if it is a real issue.

The way I see it, since the service supports neither control modifiers nor $U$ gates, but we've introduced the former anyway due to its support in the local simulator, we might as well do the same for the latter.

This can also help remind users of the full capabilities of the local simulator.