Enhancement of thermal entanglement in two-qubit XY models
Celia Anteneodo, Andr M C Souza · Journal of Optics B Quantum and Semiclassical Optics · 2003
We analyse conditions leading to enhancement of thermal entanglement in two-qubit XY models. The effect of including cross-product terms, besides the standard XY exchange interactions, in the presence of an external magnetic field, is investigated. We show that entanglement can be yielded at elevated temperatures by tuning the orientation of the external magnetic field. The details of the intrinsic exchange interactions determine the optimal orientation.