No-cloning theorem and time travel

[stevenytc]

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?

 

[netheril96]

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?

 

[Demystifier]

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.

 

[stevenytc]

Demystifier,

Thanks for your response.

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

Thanks.

 

[Demystifier]

Unitary evolution involves an evolution from t0 to t1, but not an independent evolution from t1 to t0.