Why is <n|n-2> = 0?

  • Thread starter Kidiz
  • Start date
  • #1
21
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Homework Statement



This is not really homework. I'm just studying and came across this question. So, I'm not sure if I should post this question here on one of the physics sections.

On computing ##<n|\hat{a}^2|n>##, one arrives at ##\sqrt{n}*\sqrt{n-1}<n|n-2>=0## because ##<n|n-2>=0##

Now, why is that so?
 

Answers and Replies

  • #2
954
117
Isn't that just because the two Fock states are orthogonal?
 

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