Enhancement of entanglement transfer in a spin chain by phase shift-control

K. Maruyama, T. Iitaka, F. Nori

Published 2006-10-12, updated 2007-01-24Version 2

We study the effect of a phase shift on the amount of transferrable two-spin entanglement in a spin chain. We consider a ferromagnetic Heisenberg/XY spin chain, both numerically and analytically, and two mechanisms to generate a phase shift, the Aharonov-Casher effect and the Dzyaloshinskii-Moriya interaction. In both cases, the maximum attainable entanglement is shown to be significantly enhanced, suggesting its potential usefulness in quantum information processing.