Supercomputers are just very large classical computers.

Quantum computers are the things that run at -273 deg C and use qubits to calculate all possibilities at once.

I tend to align with the views of Richard Feynman in this. We have no frame of reference when thinking of or discussing quantum effects and therefore any attempt to understand it fails.

Our limited reference framework tends to lead us to think that multiverses are copies of this universe with me having a cup of coffee this morning instead of tea.

This is not a multiverse, the closest I can get to understanding it is by anchoring my understanding that quantum effects only apply to subatomic particles at absolute zero temperature.

I tend to think that it is the universes algorithm waiting to execute its code, quantum effects are all the possible branches that code can explore and consciousness is the path the code takes once all those fields or possibilities collapse into my reality.