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  • Letter
  • Open Access

Theory of three-terminal Andreev spin qubits

Aleksandr Svetogorov1,*, Kiryl Piasotski2,3, Wolfgang Belzig1, and Mikhail Pletyukhov4

  • *Contact author: aleksandr.svetogorov@uni-konstanz.de
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Phys. Rev. B 112, L100508 – Published 26 September, 2025

DOI: https://doi.org/10.1103/55xn-c574

Abstract

In this Letter, we introduce a next generation of Andreev spin qubits—three-terminal Andreev spin qubits. These qubits outperform two-terminal devices in the speed of two-qubit gates, benefiting from enhanced spin splitting. Our theoretical analysis reveals increased tunability and interqubit coupling mediated by the supercurrent. Furthermore, it provides a comprehensive explanation for the results of a recent experiment on a three-terminal device [M. Coraiola et al., Phys. Rev. X 14, 031024 (2024)]. We identify the optimal operational regime for single- and two-qubit gates. Moreover, our concise theoretical framework for the equilibrium multiterminal Josephson effect offers significant potential for exploring nontrivial physics in the artificial dimensions of superconducting phase differences–—a rapidly growing field of research.

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Outline

Information

Phys. Rev. B 112, L100508– Published 26 September, 2025
  • Received 19 November 2024
  • Accepted 15 September 2025
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

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