Abstract

Open alternating spin chain with XY-Hamiltonian is the simplest example of inhomogeneous many-body system which allows us to address the different qubits in the chain by the different Larmor frequencies. Recently, the XY-Hamiltonian of an open finite alternating spin chain has been diagonalized [1, 2] on the basis of a generalization of the classical methods [3] for homogeneous chains and we have possibility to investigate entanglement in this system for quantum information processing tasks. In this work, the pairwise entanglement is investigated in the long alternating open spin chains with XY- Hamiltonian versus the temperature, the chain length, the distance of a pair of spins from the chain ends, and the ratio of spin-spin coupling constants [4]. In particular the bound effect on entanglement in the open spin chain is investigated.