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Homework Help: Raising and lowering operator coefficients

  1. Sep 16, 2011 #1
    1. The problem statement, all variables and given/known data
    where a=lowering operator, ad=raising operator
    ad^(2)+a*ad+ad*a+a^(2)
    just need to find the coefficients
    2. Relevant equations
    ad|n>=sqrt(n+1)|n+1>
    a|n>=sqrt(n)|n-1>
    3. The attempt at a solution
    ad^(2)=?|n+2>
    ad*a=n|n>
    a*ad=n|n>
    a^(2)=?|n-2>
    just reviewing and cant get this practice problem, I think this is where I am messing up.
     
  2. jcsd
  3. Sep 16, 2011 #2
    never mind I got it, how do I delete my post?
     
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