Majorana devices will generally be much more complicated than the single-junction or single quantum dot Majorana devices that have been realized in the literature so far. (See https://arxiv.org/abs/1610.05289 by the Station Q team for examples of complex devices.) Recently, a first step toward complex multi-gated Majorana devices—a Majorana double quantum wire—was realized by Daniel Sherman and Jeremy Yodh using epitaxial nanowires grown by Peter Krogstrup. Their paper, published recently in Nature Nanotechnology, is a relatively simple demonstration showing a crossover from the trivial to topological superconductivity in each segment of the double-wire device. Readout was a generalization of the method used by Albrecht and Higginbotham for a single Coulomb blockaded Majorana island.
Read the published version.