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Paper   IPM / Physic / 12028
School of Physics
  Title:   Density Matrix in Terms of Spin Correlation Functions for S=1 Spin Systems
1.  N. Askari
2.  J. Abouie
  Status:   Preprint
  Year:  2011
  Supported by:  IPM
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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