support quantum function in the QPE

[KetpuntoG]

Feature details

Currently the QPE template only supports operator pass-through as a matrix. It would be useful to be able to pass a quantum function and not have to think in arrays.

Implementation

No response

How important would you say this feature is?

1: Not important. Would be nice to have.

Additional information

One thing to watch out for: quantum functions have definite wires while a matrix does not. I guess they can be ignored.