- #71
atyy
Science Advisor
- 15,168
- 3,374
vanhees71 said:Of course, but then I don't use the reduced description but the state of the full system. It was exactly the example on p 10 of the above mentioned paper which lead to my question. It's as often in these interpretational discussions much ado about nothing!
It is not much ado about nothing. Not distinguishing these has mislead some into believing that decoherence solves the measurement problem, including physicists as distinguished as Anderson. If you don't like interpretation, it must be noted that most great physicists cared deeply about it. In modern times, one can read the comments about the importance of the distinction between proper and improper mixed states in https://www.amazon.com/dp/0198509146/?tag=pfamazon01-20.
Last edited by a moderator: