Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Question about basic Q.M. concept

  1. Oct 10, 2011 #1
    Before a measurement we don't have any information about a object. So we don't know about a existance of the object. But we are trying to measure something of the object. Is there operator of existance of a object? All operators commute with this?
  2. jcsd
  3. Oct 10, 2011 #2
    I wouldn't say I agree with the bolded part. For example in some quantum optics experiments, we get a signal when the thing we want to perform measurements on (photons) is detected, I am talking about http://arxiv.org/ftp/quant-ph/papers/0611/0611112.pdf" [Broken]. Actually I can't think of an example where we don't know about the existance of the object we want to measure on. Maybe someone more experienced can contribute here.
    Last edited by a moderator: May 5, 2017
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook