Realizing a robust practical majorana chain ina quantum-dot-superconductor linear array

摘要

Semiconducting nanowires in proximity to superconductors are promising experimentalsystems for realizing the elusive majorana fermions, which, because of their non-Abeliananyonic braiding statistics, may ultimately be used as building blocks for topological quantumcomputers. A serious challenge in the experimental realization of the majorana fermions isthe suppression of topological superconductivity by disorder together with the tunability ofcarrier density for semiconductors in close proximity to superconductors. Here we show thatmajorana fermions that are protected by a disorder robust topological gap can occur at theends of a chain of gate-tunable quantum dots connected by s-wave superconductors. such anarray of quantum dots provides the simplest realization of majorana fermions in systems assimple as a few quantum dot array. The proposed system provides a very practical and easilyrealizable experimental platform for the observation of non-Abelian majorana modes.