Kavli Affiliate: Srijit Goswami
| First 5 Authors: Ivan Kulesh, Sebastiaan L. D. ten Haaf, Qingzhen Wang, Vincent P. M. Sietses, Yining Zhang
| Summary:
In semiconducting-superconducting hybrid devices, Andreev bound states (ABSs)
can mediate the coupling between quantum dots (QDs), allowing for the
realisation of artificial Kitaev chains. In order to engineer Majorana bound
states (MBSs) in these systems, one must control the energy of the ABSs. In
this work, we show how extended ABSs in a flux tunable Josephson junction can
be used to control the coupling between distant quantum dots separated by
$approx$ 1 $mathrm{mu}$m. In particular, we demonstrate that the combination
of electrostatic control and phase control over the ABSs significantly
increases the parameter space in which MBSs are observed. Finally, by employing
an additional spectroscopic probe in the hybrid region between the QDs, we gain
information about the spatial distribution of the Majorana wave function in a
two-site Kitaev chain.
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