Large spin-shuttling oscillations enabling high-fidelity single-qubit gates

Physical Review Applied, vol. 24

Abstract

There have been impressive breakthroughs in semiconductor quantum dots in recent years, with single- and two-qubit gate fidelities matching other leading platforms and scalability still remaining a relative strength; however, due to qubit wiring considerations, mobile electron architectures have been proposed to facilitate upward scaling, and this opens the possibility of enlarging the motional amplitude for electric-dipole spin resonance (EDSR)-based qubit manipulation. In this work, we examine and demonstrate the possibility of significantly outperforming static-EDSR-type single-qubit pulsing by taking advantage of greater spatial mobility to achieve higher Rabi frequencies and reduce the effect of charge noise. Our theoretical results indicate that fidelities are ultimately bottlenecked by spin-valley physics, which can be suppressed through the use of quantum optimal control. We demonstrate that, across different potential regimes and competing physical models, shuttling-based single-qubit gates retain significant advantages over existing alternatives.

Authors 7

1. Akshay Menon Pazhedath

   Forschungszentrum Jülich · University of Cologne

   Affiliation as printed

   Forschungszentrum Jülich GmbH

   University of Cologne

2. Alessandro David

   Forschungszentrum Jülich

   Affiliation as printed

   Forschungszentrum Jülich GmbH

3. Max Oberländer Aachen

   RWTH Aachen University · Jülich Aachen Research Alliance

   Affiliation as printed

   JARA

   RWTH Aachen University

4. Matthias M. Müller

   Forschungszentrum Jülich

   Affiliation as printed

   Forschungszentrum Jülich GmbH

5. Tommaso Calarco

   Forschungszentrum Jülich · University of Bologna · University of Cologne

   Affiliation as printed

   Forschungszentrum Jülich GmbH

   University of Cologne

   Università di Bologna

6. Hendrik Bluhm Aachen

   RWTH Aachen University · Jülich Aachen Research Alliance

   Affiliation as printed

   ARQUE Systems GmbH

   JARA

   RWTH Aachen University

7. Felix Motzoi

   Forschungszentrum Jülich · University of Cologne

   Affiliation as printed

   Forschungszentrum Jülich GmbH

   University of Cologne