[Refact] Get rid of PyQTimeDependentEvolution

[vytautas-a]

Substitute PyQTimeDependentEvolution class with proper call to pyqtorch's time-dependent functionality.

[vytautas-a]

This refactoring disables the embedding function call for pyqtorch backend, thus currently only HamEvo block works properly. I suggest we could completely get rid of the embedding call when dealing with pyqtorch. This can be achieved by utilizing the new sympy -> ConcretizedCallable converter.

[RolandMacDoland]

Hey @vytautas-a can I mark this PR as ready ?

[vytautas-a]

@Roland-djee, well this PR here is currently more in the proposal stage. It depends also on another PR that I'll open in pyqtorch.

[RolandMacDoland]

Thanks a lot @vytautas-a looks nice and clean. Minor renaming suggestions and comments. Will approve once addressed.

[jpmoutinho]

Thanks @vytautas-a :)

Few minor things and then it should be good to go.

One thing, I see that the docs for the time-dependent HamEvo reads:

# create parameterized HamEvo block
hamevo = HamEvo(generator_td, 0.0, duration=duration)

Is passing 0.0 correct there? I thought the idea was to pass the time parameter in that argument?

[vytautas-a]

Thanks @vytautas-a :)

Few minor things and then it should be good to go.

One thing, I see that the docs for the time-dependent HamEvo reads:

# create parameterized HamEvo block
hamevo = HamEvo(generator_td, 0.0, duration=duration)

Is passing 0.0 correct there? I thought the idea was to pass the time parameter in that argument?

Yes, the docs have to updated.

[jpmoutinho]

LGTM!