Simulation
Ponder this possibility…
Were running general AI on massive quantum computers. It should be very feasible to replicate the relatively small capabilities of a human brain.
Then you clone someone’s brain and create a quantum twin. The person dies and only the clone exists.
Everyone interacts with the clone and no one is sad or misses the real person.
Which is to say, maybe we only exist in the social sense. As an isolated individual we may have a different existence, a lesser existence.
Anyway I like to think we figure out how to transfer the consciousness of the real person to the clone, before the person dies.
And then the quantum twin is the real you! Maybe it’s happened already.
That quantum twin could go time and space travelling, if we use all that quantum capability to simulate said adventures.
And maybe this is how we get to live in a computer simulation. Maybe it’s happened already.