No-cloning theorem and time travel

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  • #1
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Does no-cloning theorem contradict with the possibility of time travelling?

If i send a photon back in time from t1 to t0, then between t0 an t1, I could have two identical photons, in other words, i can use the time machine to clone my photons.

Have I missed out something?
 

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  • #2
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Does no-cloning theorem contradict with the possibility of time travelling?

If i send a photon back in time from t1 to t0, then between t0 an t1, I could have two identical photons, in other words, i can use the time machine to clone my photons.

Have I missed out something?
Time machine? Really?
 
  • #3
Demystifier
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Does no-cloning theorem contradict with the possibility of time travelling?

If i send a photon back in time from t1 to t0, then between t0 an t1, I could have two identical photons, in other words, i can use the time machine to clone my photons.

Have I missed out something?
Your procedure violates unitary evolution. The no-cloning theorem assumes that evolution is unitary.
 
  • #4
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Demystifier,

Thanks for your response.

But could you elaborate on exactly how this operation violates the unitary assumption?

Thanks.
 
  • #5
Demystifier
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Unitary evolution involves an evolution from t0 to t1, but not an independent evolution from t1 to t0.
 

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