Quantum Mechanics & Parallel Universes: No-Cloning Rule

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Discussion Overview

The discussion revolves around the implications of the no-cloning theorem in quantum mechanics in the context of parallel universes. Participants explore whether the existence of copies of oneself in different universes would violate this theorem, examining the relationship between quantum states and the concept of parallel universes.

Discussion Character

  • Debate/contested

Main Points Raised

  • One participant suggests that if there are infinite parallel universes, it is conceivable that a copy of oneself exists in one of them, questioning how the no-cloning rule applies in this scenario.
  • Another participant asserts that the no-cloning theorem does not pertain to the existence of copies in parallel universes but rather to the inability to create identical copies of arbitrary quantum states through unitary evolution.
  • A further response reiterates that the no-cloning rule does not apply to the scenario of parallel universes, emphasizing that the theorem's implications are specific to quantum states and their evolution.

Areas of Agreement / Disagreement

Participants generally disagree on the application of the no-cloning theorem to the concept of parallel universes, with some asserting it does not apply while others question its relevance.

Contextual Notes

The discussion does not resolve the implications of the no-cloning theorem in relation to parallel universes, and assumptions about the nature of quantum states and their evolution remain unaddressed.

Lunct
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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.
 
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No. This is not what the no-cloning theorem says.
 
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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.
 
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Lunct said:
Would the no-cloning rule of quantum mechanics apply here?

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

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

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