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

Edoardo Latini*, Fausto Rossi†, and Fabrizio Dolcini‡

  • *Contact author: edoardo.latini@polito.it
  • †Contact author: fausto.rossi@polito.it
  • ‡Contact author: fabrizio.dolcini@polito.it
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Phys. Rev. Research 8, 033197 – Published 17 August, 2026

DOI: https://doi.org/10.1103/jwtl-dz3v

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.

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Phys. Rev. Research 8, 033197– Published 17 August, 2026
  • Received 3 February 2026
  • Accepted 17 July 2026
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