- #1

nomadreid

Gold Member

- 1,481

- 150

"The correct interpretation of the uncertainty principle is that if we prepare a large number of quantum systems in identical states....."

However, according to the no-cloning theorem, we cannot perfectly copy an arbitrarily chosen unknown quantum state. So, do the authors mean "...if we were able to prepare (although in reality we cannot) a large number...." or "....if it happened that there were a large number of quantum systems in identical states and we knew that without measurement (which would collapse the states)...." Seems almost metaphysical to me, but maybe I am misinterpreting what Nielsen and Chuang meant, or maybe I am misinterpreting the no-cloning theorem, or maybe I am misapplying.

Any help would be appreciated.