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Two-spin entanglement distribution near factorized states

2007
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Journal of Physics A: Mathematical and Theoretical
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We study the two-spin entanglement distribution along the infinite $S=1/2$ chain described by the XY model in a transverse field; closed analytical expressions are derived for the one-tangle and the concurrences $C_r$, $r$ being the distance between the two possibly entangled spins, for values of the Hamiltonian parameters close to those corresponding to factorized ground states. The total amount of entanglement, the fraction of such entanglement which is stored in pairwise entanglement, and

doi:10.1088/1751-8113/40/32/010
fatcat:rmherxu3ubbv7e3yvqtrlfz7da