Conductance spectroscopy of superconducting devices is a common tool for probing Andreev and Majorana bound states. Recently, three-terminal conductance spectroscopy has been investigated because of some limitations of two-terminal ones. In this talk, I will first introduce some basics of conductance calculation of a metal-superconductor junction. Then I will derive the sub-gap conductance matrix for the normal leads in a three-terminal setup and its symmetric decomposition. The relation between the nonlocal conductance and the local BCS charges of the bound states close to the normal probes will be discussed.[1] Finally, an example, a semiconductor nanowire supporting MZM, is investigated in both numerical and experimental methods.[1,2]

[1] Danon J, Hellenes A B, Hansen E B, et al. Phys. Rev. Lett. 124, 036801 (2020).

[2] Ménard G C, Anselmetti G L R, Martinez E A, et al. Phys. Rev. Lett. 124, 036802 (2020).