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Micromagnet-free operation of electron spin qubits in Si/Si1−xGex vertical double quantum dots

Abhikbrata Sarkar1,* and Daniel Loss1,2,3,4

  • *Contact author: abhikbrata.sarkar@unibas.ch
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Phys. Rev. Research 8, 023232 – Published 1 June, 2026

DOI: https://doi.org/10.1103/rsnv-mnlw

Abstract

We study a vertical double quantum dot (DQD) in a Si/Si1−xGex/Si double-well heterostructure for full electrical control of electron Loss-DiVincenzo (LD) spin qubits, using realistic device modeling and numerical simulations. Due to the emerging spin-orbit interaction in the DQD, as well as strain from the gate electrodes, small (percentage range) but finite g-tensor variations emerge. In addition, we find a large valley splitting, on the order of Ev∼250µeV. As a result, multiple avenues for fast electrical single-qubit rotations emerge. An ac electric field gives rise to electric dipole spin resonance, while electron spin resonance in the presence of an ac magnetic field can be electrically controlled by local gates due to varying g factors in DQDs. We also show that shuttling between neighboring dots, in vertical and horizontal directions, results in ultrafast single-qubit gates of less than a nanosecond. Remarkably, this DQD architecture completely eliminates the need for micromagnets, significantly facilitating the scalability of LD spin qubits in semiconductor foundries.

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Phys. Rev. Research 8, 023232– Published 1 June, 2026
  • Received 21 December 2025
  • Accepted 29 April 2026
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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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