# A topological Josephson junction platform for creating, manipulating, and braiding Majorana bound states

## TL;DR

This paper proposes a topological Josephson junction platform using topological insulators and magnetic fields to create, manipulate, and braid Majorana bound states, enabling quantum operations with experimental feasibility.

## Contribution

It introduces a novel Josephson junction architecture that allows for the creation, manipulation, and braiding of Majorana bound states using magnetic vortices, distinct from nanowire systems.

## Key findings

- Protocols for braiding Majorana states via vortex exchange
- Methods to control Majorana coupling through vortex positioning
- Detection of Majorana states via Josephson current-phase measurements

## Abstract

As part of the intense effort towards identifying platforms in which Majorana bound states can be realized and manipulated to perform qubit operations, we propose a topological Josephson junction architecture that achieves these capabilities and which can be experimentally implemented. The platform uses conventional superconducting electrodes deposited on a topological insulator film to form networks of proximity-coupled lateral Josephson junctions. Magnetic fields threading the network of junction barriers create Josephson vortices that host Majorana bound states localized in the junction where the local phase difference is an odd multiple of $\pi$, i.e. attached to the cores of the Josephson vortices. This enables us to manipulate the Majorana states by moving the Josephson vortices, achieving functionality exclusive to these systems in contrast to others, such as those composed of topological superconductor nanowires. We describe protocols for: 1) braiding localized Majorana states by exchange, 2) controlling the separation and hence the coupling of adjacent localized Majorana states to effect non-Abelian rotations via hybridization of the Majorana modes, and 3) reading out changes in the non-local parity correlations induced by such operations. These schemes make use of the application of current pulses and local magnetic field pulses to control the location of vortices, and measurements of the Josephson current-phase relation to reveal the presence of the Majorana bound states. We describe the architecture and schemes in the context of experiments currently underway.