Tuning the entanglement for a one-dimensional magnetic system with anisotropic coupling and impurities
Omar Osenda, Zhen Huang, Sabre Kais · Physical Review A · 2003
We study a set of localized spins coupled through exchange interaction and subject to an external magnetic field. We demonstrate, for such a class of one-dimensional magnetic systems, that entanglement can be controlled and tuned by varying the anisotropy parameter in the Hamiltonian and by introducing impurities into the systems. In particular, for certain parameters, the entanglement is zero up to a critical point ${\ensuremath{\lambda}}_{c},$ where a quantum phase transition occurs, and is different from zero above ${\ensuremath{\lambda}}_{c}.$