The Everett interpretation had Level III (quantum) parallel universes as its hallmark, but you can see in the figure that you can safely ignore them, because they’re all indistinguishable. In this sense, the Level I and Level III multiverses are unified: as long as you have an infinite space with a Level I multiverse, you can ignore all its Level III parallel universes, since they’re in practice all just identical copies.
as long as you have an infinite space with a Level I multiverse, you can ignore all its Level III parallel universes, since they’re in practice all just identical copies.
