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If you have an operator a represented in some basis l1>, l2> you find its matrix elements by doing
Aij = <ilAlj>
But more oftenly you are interested in the expectation value of A. So you take:
<ψlAlψ>. My teacher tends to call these numbers matrix elements too. But which matrix element in A is this and how do I realize that? :)
Aij = <ilAlj>
But more oftenly you are interested in the expectation value of A. So you take:
<ψlAlψ>. My teacher tends to call these numbers matrix elements too. But which matrix element in A is this and how do I realize that? :)
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