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Homework Help: 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
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