  Superconductors can be classified as topological or not based on whether
time-reversal symmetry (TRS), chiral symmetry, and particle-hole symmetry are
preserved or not. Further, topological superconductors can also be classified
as chiral or helical. In this paper, using Hanbury-Brown and Twiss (HBT) shot
noise correlations and the non-local conductance, we probe metal/2D
unconventional superconductor/metal junctions to understand better the pairing
topological vs. non-topological or helical vs. chiral or nodal vs. gapful. We
see that HBT correlations are asymmetric as a function of bias voltage for
non-topological superconductors, whereas they are symmetric for topological
superconductors irrespective of the barrier strength. Topological
superconductors are associated with Majorana fermions which are important for
topological quantum computation. By distinguishing topological superconductors
from non-topological superconductors, our study will help search for Majorana
fermions, which will aid in designing a topological quantum computer.
