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Paper IPM / P / 12028  


Abstract:  
In this paper, it has been presented a general form for the density
matrix operator of the S=1 spin systems which are invariant under
the parity. We have obtained the density matrix operator in terms of
spin correlation functions. I.e. it has been shown that, unlike the
S=[1/2] spin systems, the density matrix depends to the two,
three and four point correlation functions. Thus, the entanglement
(which shows the amount of quantum correlations in the system) are
crucially dependent to the information arise from two, three and
four point correlations. PACS No. 75.25
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