Question: Consider an ensemble of spin 1 systems. The density matrix is now a 3 x 3 matrix. How many independent (real) parameters are needed to

Consider an ensemble of spin 1 systems. The density matrix is now a 3 x 3 matrix. How many independent (real) parameters are needed to characterize the density matrix? What must we know in addition to [Sx], [Sy], and [Sz] to characterize the ensemble completely?

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