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Geocentric
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Homework Statement
I have been given a problem. The density matrix can be constructed if the ensemble average of Sx, Sy and Sz are given. But I have no idea on how to construct the density matrix from these Si's. Any help is most welcome.
Homework Equations
Ensemble average(Si)=Trace([tex]\rho[/tex]Si)
Density operator([tex]\rho[/tex]) = wa.Pa + wb.Pb
where Pa & Pb are projection operators