In this Letter we investigate the interplay between Zeeman splitting and the exchange-induced swap operation in Heisenberg XY model. It is shown that the anisotropic exchange coupling can rule out the swap action even if the magnetic field is homogeneous. The time-evolution of entanglement is also studied and we find that the degree of entanglement of the two spins is suppressed in the presence of inhomogeneous magnetic fields. © 2005 Elsevier B.V. All rights reserved.
Yin, W., Liang, J. Q., & Yan, Q. W. (2005). Interplay between anisotropic exchange coupling and the swap operation in the two-qubit Heisenberg XY model. Physics Letters, Section A: General, Atomic and Solid State Physics, 339(6), 472–477. https://doi.org/10.1016/j.physleta.2005.02.069