  We investigate the influence of the superconducting (S) proximity effect in
the quantum Hall (QH) regime by computing the charge conductance flowing
through a graphene-based QH/S/QH junction. This situation offers the exciting
possibility of studying the fate of topological edge states when they
experience tunneling processes through the superconductor. We predict the
appearance of conductance peaks at integer values of the Landau level filling
factor, as a consequence of the quantum interferences taking place at the
junction, and provide a semiclassical analysis allowing for a natural
interpretation of these interferences in terms of electron and hole
trajectories propagating along the QH/S interfaces. Our results suggest that
non-trivial junctions between topologically distinct phases could offer a
highly tunable means of partitioning the flow of edge states.
