Assalam Alaikum Warahmatullahi Wabarakatuh,

Hermetian operators means that their eigenvalues are real <<<
so you can measure them experimentally
,,,,


....

actually I couldn’t write the formulas here ,
but you can find the prove here:


and here


I abologise because I don’t have an arabic keyboard,
please make -Dua’a- for me , I have an exam this week...

Cheers,