Sounds like fiat.
Scientists Discovered a Way to Reverse Time—and Possibly Erase Mistakes
https://www.popularmechanics.com/science/a65593746/time-travel-in-the-quantum-realm/
In the subatomic universe of quantum physics, you can achieve things considered impossible in our flesh-and-blood physical world. Things like superposition, entanglement, and even teleportation all seem possible when things go quantum. Now, scientists from the Austrian Academy of Sciences (ÖAW) and University of Vienna are adding a kind of time travel to the list.
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