Efficient quantum-state transfer is achieved in a uniformly coupled spin-1/2 chain, with open boundaries, by application of local magnetic fields on the second and last-but-one spins, respectively. These effective \textit{barriers} induce appearance of two eigenstates, bi-localized at the edges of the chain, which allow a high quality transfer also at relatively long distances. The same mechanism may be used to send an entire e-bit (e.g., an entangled qubit pair) from one to the other end of the chain.
@article{arxiv.1301.1774,
title = {Quantum-state transfer via resonant tunnelling through local field induced barriers},
author = {S. Lorenzo and T. J. G. Apollaro and A. Sindona and F. Plastina},
journal= {arXiv preprint arXiv:1301.1774},
year = {2015}
}