Magnetic field-free braiding and nontrivial fusion of Majorana bound states in a high-temperature planar Josephson junction

Demonstration of non-Abelian statistics of Majorana bound states (MBS) is crucial for the realization of fault-tolerant topological quantum computation. Two-dimensional platforms such as planar Josephson junction (PJJ) require an in-plane magnetic field to generate a pair of MBS at its non-superconducting channel ends; however, the fixed direction of the in-plane magnetic field puts a constraint on the realization of a multi-terminal topological planar junction, and hence its ability to physically move multiple MBS-which is necessary for performing the fusion and braiding operations. Here we show that in a PJJ coupled to a Skyrmion crystal, which can generate multiple pairs of MBS in the absence of any external magnetic field, the non-trivial fusion and braiding operations can be performed. Our numerical calculations, designed for realistic two-dimensional quantum systems, certify the feasibility of experimental realization of the proposed device schemes. We find that both-wave and-wave superconducting leads can generate the MBS; indicating that the MBS movement operations can be performed at higher temperatures using-wave superconducting leads. Our results establish that the Skyrmion crystal-coupled PJJ is a viable platform for the generation and controlled movement of the MBS.