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Hi all.

The expectation value for S_x (spin in x-direction) is:

[tex]

\left\langle {S_x } \right\rangle = \left\langle {\phi |S_x \phi } \right\rangle = \phi ^\dag S_x \phi

[/tex]

where \phi is the state and \phi^"sword" is the hermite conjugate.

My question is: I thought that when finding expectation values, you are supposed to complex conjugate the left part of the inner product, not hermite conjugate?

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# Homework Help: QM: Expectation values of spin

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