- #1
Niles
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Homework Statement
Hi
My book uses the following in a calculation
[tex]
\left\langle a \right\rangle \left\langle {b^\dagger } \right\rangle + \left\langle {a^\dagger } \right\rangle \left\langle b \right\rangle = 2\operatorname{Re} \left[ {\left\langle a \right\rangle \left\langle {b^\dagger } \right\rangle } \right]
[/tex]
where a and b are QM operators. I agree with the relation [itex]z^*+z=\text{Re}(z)[/itex] (for z a complex variable), but in the above case the conjugation is on the operator, not the expectation value itself. Is the relation valid?Niles.
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