  Novel designs of Josephson weak links based on semiconducting nanowires
combined with circuit QED techniques have enabled the resolution of their fine
structure due to spin-orbit interactions, opening a path towards Andreev spin
qubits. Nevertheless, direct manipulation of the spin within a given Andreev
state is in general suppressed compared to inter-doublet manipulation in the
absence of Zeeman effects. In addition, noisy spin-flip mechanisms limit any
coherent manipulation protocol to spin post-selection. We propose a combination
of a spin polarization protocol analogous to sideband cooling with stimulated
Raman adiabatic passage specifically tailored for these systems. We show this
approach is robust for a large range of design parameters, including the
currently rather stringent coherence times.
