Novel designs of Josephson weak links based on Tracks 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 interdoublet manipulation in the absence of Zeeman effects.In addition, noisy spin-flip mechanisms limit any coherent manipulation protocol to spin postselection.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 Cotton Balls rather stringent coherence times.