Squeezed hole spin qubits in Ge quantum dots with ultrafast gates at low power

Stefano Bosco, Mónica Benito, Christoph Adelsberger, and Daniel Loss
Phys. Rev. B 104, 115425 – Published 20 September 2021

Abstract

Hole spin qubits in planar Ge heterostructures are one of the frontrunner platforms for scalable quantum computers. In these systems, the spin-orbit interactions permit efficient all-electric qubit control. We propose a minimal design modification of planar devices that enhances these interactions by orders of magnitude and enables low power ultrafast qubit operations in the GHz range. Our approach is based on an asymmetric potential that strongly squeezes the quantum dot in one direction. This confinement-induced spin-orbit interaction does not rely on microscopic details of the device such as growth direction or strain and could be turned on and off on demand in state-of-the-art qubits.

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  • Received 30 March 2021
  • Revised 23 August 2021
  • Accepted 26 August 2021

DOI:https://doi.org/10.1103/PhysRevB.104.115425

©2021 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied PhysicsGeneral PhysicsQuantum Information, Science & Technology

Authors & Affiliations

Stefano Bosco*, Mónica Benito, Christoph Adelsberger, and Daniel Loss

  • Department of Physics, University of Basel, Klingelbergstrasse 82, 4056 Basel, Switzerland

  • *stefano.bosco@unibas.ch
  • Present address: Institute of Physics, University of Augsburg, 86135 Augsburg, Germany

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Issue

Vol. 104, Iss. 11 — 15 September 2021

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