Topological superconductors (TSCs) have garnered significant research and
industry attention in the past two decades. By hosting Majorana bound states
which can be used as qubits that are robust against local perturbations, TSCs
offer a promising platform toward (non-universal) topological quantum
computation. However, there has been a scarcity of TSC candidates, and the
experimental signatures that identify a TSC are often elusive. In this
perspective, after a short review of the TSC basics and theories, we provide an
overview of the TSC materials candidates, including natural compounds and
synthetic material systems. We further introduce various experimental
techniques to probe TSC, focusing on how a system is identified as a TSC
candidate, and why a conclusive answer is often challenging to draw. We
conclude by calling for new experimental signatures and stronger computational
support to accelerate the search for new TSC candidates.Comment: 42 pages, 6 figure