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Two-terminal conductance spectroscopy of superconducting devices is a commontool for probing Andreev and Majorana bound states. Here, we studytheoretically a three-terminal setup, with two normal leads coupled to agrounded superconducting terminal. Using a single-electron scattering matrix,we derive the subgap conductance matrix for the normal leads and discuss itssymmetries. In particular, we show that the local and the nonlocal elements ofthe conductance matrix have pairwise identical antisymmetric components.Moreover, we find that the nonlocal elements are directly related to the localBCS charges of the bound states close to the normal probes and we show how theBCS charge of overlapping Majorana bound states can be extracted fromexperiments.

Nonlocal conductance spectroscopy of Andreev bound states: Symmetry relations and BCS charges