- #1
greypilgrim
- 547
- 38
Hi,
I know the common proof of the no-cloning theorem assuming the cloning apparatus acts unitarily on the system and leading this to a contradiction.
But what about a non-unitarian apparatus that involves measurements? I'm pretty sure cloning is still impossible, but I don't know how to prove it in full generality, since you could do very elaborate measurement procedures that could involve entanglement swapping or unitarily evolving parts.
Somebody knows a short proof?
I know the common proof of the no-cloning theorem assuming the cloning apparatus acts unitarily on the system and leading this to a contradiction.
But what about a non-unitarian apparatus that involves measurements? I'm pretty sure cloning is still impossible, but I don't know how to prove it in full generality, since you could do very elaborate measurement procedures that could involve entanglement swapping or unitarily evolving parts.
Somebody knows a short proof?