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State/wave function after measurement?

  1. Oct 3, 2009 #1
    If i already know the wave function then measure an observable what is the new wave function?

    Is it just the eigenfunction of the observable corresponding to the measured value?

    And does it stay in this state until something interacts with it?
  2. jcsd
  3. Oct 3, 2009 #2


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    Science Advisor

    Yes, at least according to the simplest measurement model.

    No, it evolves according the the Schrodinger equation with this state as the initial condition.
  4. Oct 3, 2009 #3
    ahh yes of course, much thanks
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