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Homework Help: Amplitude for a particle in state

  1. Sep 30, 2006 #1
    <-z|x> is the amplitude for a particle in state |x> to be in state |-z>.

    a particle in state |x> can be in |+x> or |-x>, correct?

    |+x> = [1/sqrt(2)]|+z> + [1/sqrt(2)]|-z>

    |-x> = [1/sqrt(2)]|+z> - [1/sqrt(2)]|-z>

    How would this be calculated?

    Would the amplitude be:

    <-z|+x> + <-z|-x>?

    |<-z|+x>| + |<-z|-x>|?
  2. jcsd
  3. Oct 2, 2006 #2


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    I've never seen the [itex] |-z\rangle [/itex] notation before. But [itex] -|z\rangle [/itex] is a common one.

  4. Oct 4, 2006 #3
    I've used this notation before, but there was always a differentiation between |+x> and |-x>, I never saw just |x>. Perhaps |x> means |+x>?

    If this is the case in order to get the amplitude you want <-z|+x>. Only do |<-z|+x>| for the probablility.
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