High-fidelity quantum information transport is necessary for most practical models of quantum computation. By analogy with optical waveguides, a spatiotemporally varying magnetic potential on a one-dimensional spin chain can achieve high-fidelity transport of spin excitations. By comparing different potential shapes, we establish the effects of potential shape on the fidelity and transport speed. We incorporate disorder into our model and show methods to minimize its effect on transport. Finally, we discuss implementations of our scheme in several accessible systems based on hydrogenic approximations.

• Received 4 December 2014

DOI:https://doi.org/10.1103/PhysRevA.91.022306