Completely isolated systems seem more and more like a theoretical abstraction, not a reality.
If you want true isolation, place it inside the event horizon of a black hole. Or spin up a child universe then cut off the connection. Even then some clever cookie might find ways for information to percolate from one continuum to another.
> If you want true isolation, place it inside the event horizon of a black hole.
There's a hypothesis supported by some physicists that black holes in some way export the information content of the things they previously swallowed via Hawking radiation. Hawking himself apparently has not endorsed this interpretation.
If you want true isolation, place it inside the event horizon of a black hole. Or spin up a child universe then cut off the connection. Even then some clever cookie might find ways for information to percolate from one continuum to another.