-1
$\begingroup$

Collapse of wave function ,does it really happens?why?

$\endgroup$
  • 4
    $\begingroup$ There is no spoon... $\endgroup$ – user6760 Jan 8 '19 at 3:21
  • 3
    $\begingroup$ This is a hard question, about which whole books have been written. Have you poked around wikipedia for any relevant entries? recommend you have a look and then come back here if there's anything remaining that still puzzles you. -NN $\endgroup$ – niels nielsen Jan 8 '19 at 3:56
  • $\begingroup$ No. Collapse doesn't happen. Read "The Fabric of Reality" by David Deutsch chapter 2. $\endgroup$ – alanf Jan 8 '19 at 8:00
2
$\begingroup$

Schlosshauer reviewed experimental data and concluded: "no positive experimental evidence exists for physical state-vector collapse" (Annals of Physics, 321 (2006) 112-149)

$\endgroup$
  • 1
    $\begingroup$ The notion of a wave function collapsing isn't a dynamical thing that is an observable though $\endgroup$ – InertialObserver Jan 8 '19 at 3:24
  • $\begingroup$ @InertialObserver : The OP asks if collapse of wave function really happens, and my answer is there is no experimental evidence of that. $\endgroup$ – akhmeteli Jan 8 '19 at 3:30
  • 1
    $\begingroup$ Something happens though whether you call it a "collapse" or not. It is an easily observable effect, e.g. in a double slit experiment. There was a wave and now it is no more. Sounds evidence enough, no? $\endgroup$ – safesphere Jan 8 '19 at 7:36
  • $\begingroup$ @safesphere : No, there is no experimental evidence of deviations from unitary evolution. From the same article: "the universal validity of unitary dynamics and the superposition principle has been confirmed far into the mesoscopic and macroscopic realm in all experiments conducted thus far" $\endgroup$ – akhmeteli Jan 8 '19 at 7:59
  • 1
    $\begingroup$ Well, I hear you, but I didn't say anything about "unitary evolution". It seems that you are assuming that I've implied this and that in my comment, but I really haven't. All I'm saying, it is easily observable that a wave is killed by measurement. This is an experimental fact. The wave was there, but no more. You can call it "collapse" or "murder", whatever, but the wave is destroyed. $\endgroup$ – safesphere Jan 8 '19 at 8:20

Not the answer you're looking for? Browse other questions tagged or ask your own question.