Distinguishing between Topological and Quasi Majorana Zero Modes with a Dissipative Resonant Level

Distinguishing between topological Majorana zero modes and quasi Majorana modes – trivial low energy Andreev bound states – is an important step towards realizing topological hybrid nanowire devices. We propose that this distinction can be made by connecting a hybrid nanowire to a dissipative resonant level realized by a quantum dot weakly coupled to high resistance leads. We show that the qualitative temperature scaling of the width of the resonant level zero bias conductance peak provides a signature unique to true Majorana zero modes. The degeneracy induced by a true Majorana zero mode is further shown to stabilize this conductance peak against particle-hole asymmetry.