Kavli Affiliate: Michael Wimmer
| First 5 Authors: Chun-Xiao Liu, Sebastian Miles, Alberto Bordin, Sebastiaan L. D. ten Haaf, A. Mert Bozkurt
| Summary:
Quantum dot-superconductor arrays have emerged as a new and promising
material platform for realizing Kitaev chains with Majorana zero modes. So far,
experiments have implemented a two-site chain with limited protection. We
propose a protocol for scaling up the Kitaev chain that is accessible to
current experiments and optimizes the Majorana protection. To this end, we make
use of the fact that the relative sign of normal and superconducting hoppings
mediated by an Andreev bound state can be changed by electrostatic gates. In
this way, our method only relies on the use of individual electrostatic gates
on hybrid regions, quantum dots, and tunnel barriers, respectively, without the
need for individual magnetic flux control, greatly simplifying the device
design. Our work provides guidance for realizing a topologically protected
Kitaev chain, which is the building block of error-resilient topological
quantum computation.
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