B Quantum Mechanics & Parallel Universes: No-Cloning Rule

[Lunct]

So if there are a near infinite number of parallel universes, many people say that one can exist in multiple universes because there are so many one of them is bound to have a copy of you in it. Would the no-cloning rule of quantum mechanics apply here? If there was an exact copy (all the quantum systems are the same) of you in a parallel universe that is a ridiculous number of light years away, would the no-cloning rule not apply, or would the information that there is another clone travel at the speed of light? How would it work - I have no idea.

 

[Orodruin]

No. This is not what the no-cloning theorem says.

 

[Orodruin]

The no-cloning theorem is not about the possibility of having a copy of yourself in another universe, it is about the possibility of having a unitary evolution of a quantum state in $H\times H$ copy the state of the first Hilbert space to the second regardless of the initial state in the second.

 

[PeterDonis]

Would the no-cloning rule of quantum mechanics apply here?

As has been explained, the answer is "no".

Thread closed.

 

[PeterDonis]

Moderator's note: An off topic subthread has been deleted.