  The proximity effect of superconductivity on confined states in
semiconductors gives rise to various bound states such as Andreev bound states
(ABSs), Andreev molecules and Majorana zero modes. While such bound states do
not conserve charge, their Fermion parity is a good quantum number. One way to
measure parity is to convert it to charge first, which is then sensed. In this
work, we sense the charge of ABSs and Andreev molecules in an InSb-Al hybrid
nanowire using an integrated quantum dot operated as a charge sensor. We show
how charge sensing measurements can resolve the even and odd states of an
Andreev molecule, without affecting the parity. Such an approach can be further
utilized for parity measurements of Majorana zero modes in Kitaev chains based
on quantum dots.
