Abstract
Second-order topological superconductors (SOTSs) host localized Majorana
fermions and provide a new platform for topological quantum computation. We
propose a remarkable and feasible way to realize networks based on SOTSs which
allow to nucleate and braid Majorana bound states (MBSs) in an all-electrical
manner without fine-tuning. The proposed setups are scalable in a
straightforward way and can accommodate any even number of MBSs. Moreover, the
MBSs in the networks allow defining qubits whose states can be initialized and
read out by measuring Josephson currents flowing between SOTS islands. Our
proposal can be implemented in monolayers of $FeTe_1-xSe_x$
and inverted Hg(Cd)Te quantum wells in proximity to conventional
superconductors.
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