Andreev bound states are the basis of the microscopic picture of the Josephson effect, describing the coupling of two superconductors via a weak link by the formation of localized, single quasiparticle states decoupled from the continuum above the superconducting gap. With the recent improvement of superconductor-semiconductor nanoscale hybrid devices, the readout and manipulation of quasiparticles occupying the Andreev levels became experimentally feasible.

In this talk, I will discuss the experimental settings for the measurement of individual Andreev levels in this system. Then, I will provide an overview of the quantum manipulation of the quasiparticle charge and spin, and finally showcase our ongoing efforts towards scalable quantum technologies with Andreev levels.