Long-range spin transfer using individual electrons

Transporting ensembles of electrons over long distances without losing their spin polarization is an important benchmark for spintronic devices. Using the tools developed to control and to measure individual electron spins in semiconductor nanostructures, we demonstrate that spin information carried by one or two electrons can be transferred between two quantum dots separated by a distance of 4 microns with a 30 % fidelity limited by spin flips prior to the spin transfer.