Researchers at AGH University of Science and Technology, in collaboration with King Fahd University of Petroleum and Minerals and University of Basel, have established a novel spin-resolved transport protocol for characterising the spin polarisation of Majorana corner states within two-dimensional second-order topological superconductors. Paweł Szumniak and colleagues demonstrate a distinct spatial distribution of electronic spin polarisation within these states, offering a means to identify each state by its intrinsic spin. The findings represent a significant step towards realising robust quantum computation by harnessing the unique properties of these exotic quasiparticles and the topological protection they offer. Spin polarisation reveals identification of Majorana corner states Scientists have long sought methods to definitively verify the spin properties of Majorana corner states, elusive quasiparticles predicted to exist at the corners of two-dimensional second-order topological superconductors. These states are of considerable interest due to their potential application in topological quantum computing, where their inherent robustness against local perturbations could lead to more stable and reliable quantum bits. Previously, experimentally distinguishing between the two Majorana corner states present in a system, and confirming their spin characteristics, posed a substantial challenge. The developed spin-resolved transport protocol addresses this by correlating measurable electrical signals with the spin density of the Majorana corner states. The methodology relies on precise measurements of both local and nonlocal conductance, revealing a direct relationship with the electronic spin polarisation. Numerical modelling confirms that each Majorana corner state exhibits a unique spatial distribution of electronic spin polarisation when subjected to an in-plane magnetic field. Specifically, the simulations demonstrate opposite signs of spin polarisation for each of the two corner states, allowing for unambiguous identification and labelling. This spatial distribution is crucial; the spin polarisation is oriented perpendicular to the applied magnetic field, creating a detectable asymmetry in the transport properties. The researchers employed