Andreev spin qubits based on the helical edge states of magnetically doped two-dimensional topological insulators

Abstract:We show that Andreev spin qubits can be realized in a Josephson junction based on the helical edge states of a two-dimensional topological insulator (quantum spin Hall system) proximized by superconducting films, in the presence of magnetic doping. We demonstrate that the electric dipole transitions between the Andreev spin states induced by the magnetic doping can be harnessed to manipulate the Andreev spin qubit by microwave radiation pulses, without applying an external Zeeman field or invoking ancillary states. We numerically simulate the realization of NOT and Hadamard quantum logic gates, and discuss implementations in realistic setups.

20 pages, 10 figures. Data available at Zenodo: this https URL

Mesoscale and Nanoscale Physics (cond-mat.mes-hall); Superconductivity (cond-mat.supr-con); Quantum Physics (quant-ph)

arXiv:2601.22226 [cond-mat.mes-hall]

(or arXiv:2601.22226v3 [cond-mat.mes-hall] for this version)

https://doi.org/10.48550/arXiv.2601.22226 Focus to learn more arXiv-issued DOI via DataCite

Phys. Rev. Research 8, 033197 (2026)

https://doi.org/10.1103/jwtl-dz3v Focus to learn more DOI(s) linking to related resources

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