Kavli Affiliate: Michael Wimmer
| First 5 Authors: Chun-Xiao Liu, Sebastian Miles, Alberto Bordin, Sebastiaan L. D. ten Haaf, Grzegorz P. Mazur
| Summary:
Quantum dot-superconductor arrays have emerged as a new and promising
material platform for realizing topological Kitaev chains. So far, experiments
have implemented a two-site chain with limited protection. Here we propose an
experimentally feasible protocol for scaling up the chain in order to enhance
the protection of the Majorana zero modes. 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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