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Paper   IPM / Physic / 13903
School of Physics
  Title:   Entanglement in parity invariant mixed spin systems
1.  N. Askari
2.  J. Abouie
  Status:   Preprint
  Year:  2015
  Supported by:  IPM
We find that the entanglement, as quantified by negativity, between two spins in two general classes of parity invariant heterogeneous spin-(1,1/2)systems, can be expressed in terms of spin-spin correlation functions. We show explicitly that in addition to one and two-point correlations, the triad correlations play crucial role in the bipartite entanglement. These correlations represent the spin 1/2-quadrupole. Utilizing these results, the entanglement in several systems of interest with higher symmetries is also studied.

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