Dynamics and Fusion of Majorana Zero Modes in Quantum-dot based Interacting Kitaev Chains

Abstract

Motivated by the recent experimental realization of a minimal Kitaev chain in quantum dot systems, we present our theoretical findings on the dynamics and fusion of MZMs at or near the $‘‘$sweet spot" $t_h=\Delta$ (where the fermionic hopping $t_h$ and superconducting coupling $\Delta$ are equal). We investigated the dynamics and fusion of MZMs using time-dependent real-space local density-of-states methods. The movement of Majoranas and the detection of fusion channels are crucial for topological quantum computations. Additionally, we discuss our recent discovery of exotic $‘‘$multi-site" MZMs in $Y$-shaped Kitaev wires, which is important for the potential braiding of Majoranas in $Y$-junctions formed from arrays of quantum dots. Finally, we present results on "non-trivial" fusion using canonical Kitaev wires at the sweet spot.

6 pages and 2 figures