For a receiver (or ppl in the field would say detector), you convert quantum information to classical information and that's fine.
Now for a repeater, you also convert quantum information to classical information. But then you want to recreate the original quantum state based on the classical information you've obtained. And that is impossible.
If you want to find out more about the impossibility statement above, try to google "No Cloning Theorem"
Slashdot Mirror
For a receiver (or ppl in the field would say detector), you convert quantum information to classical information and that's fine.
Now for a repeater, you also convert quantum information to classical information. But then you want to recreate the original quantum state based on the classical information you've obtained. And that is impossible.
If you want to find out more about the impossibility statement above, try to google "No Cloning Theorem"