A quantum superposition craft, which solves numerous problems of travel over vast distances or time. You sit in a control room on your home world and are simultaneously in a craft on another. Or, the craft is simply a door that you can step through, connected via quantum superposition.
That sounds like what the recent whistleblower described, when someone stepped into a 30-foot, disc-shaped craft and inside it was a much larger room (as big as a football stadium, IIRC?). And it makes more sense to me than the Harry Potter, magic tent explanation.
Inter-dimensional advanced technology from a future period of earth...
I've thought this myself numerous times. Fascinating alternative to consider, especially if you look at it from an anthropological or sociological perspective (studying our ancient selves to see how we developed).
Or maybe we're just somebody's big zoo, civ experiment or farm...
“A quantum superposition craft, which solves numerous problems of travel over vast distances or time. You sit in a control room on your home world and are simultaneously in a craft on another. Or, the craft is simply a door that you can step through, connected via quantum superposition.”
Well, #1 you are talking about quantum entanglement and “quantum teleportation”, not quantum superposition. And #2, neither of those would actually work the way you describe.