You've got to entangle the same machine first over a massive macro quantum space-time superposition.
this post was submitted on 13 Mar 2025
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See, you get it.
One way to resolve this is to have some kind of multiverse theory where you don't travel back in time to your universe, but to a narrow slection of parallel universes that are also shifted slightly so that it spits you out in an analogous location to your initial departure.
I always wondered about this
Same place relative to what?
It's space-time, not space and time. Moving backwards in one moves you backwards in the other.
This is not how general relativity works at all. If your coordinates are set to a spot on Earth (or some spot relative to Earth), you will appear at that same point. Spacetime exhibits something called diffeomorphism covariance which is a fancy way of saying you'd have to go out of your way in the dumbest way possible to get this outcome.