Abstract

The control of "flying” (or moving) spin qubits is an important functionality for the manipulation and exchange of quantum information between remote locations on a chip. Typically, gates based on electric or magnetic fields provide the necessary perturbation for their control either globally or at well-defined locations. Here, we demonstrate the dynamic control of moving electron spins via contactless gates that move together with the spins. The concept is realized using electron spins trapped and transported by moving potential dots defined by a surface acoustic wave (SAW). The SAW strain at the electron trapping site, which is set by the SAW amplitude, acts as a contactless, tunable gate that controls the precession frequency of the flying spins via the spin-orbit interaction. We show that the degree of precession control in moving dots exceeds previously reported results for unconstrained transport by an order of magnitude and is well accounted for by a theoretical model for the strain contribution to the spin-orbit interaction. This flying spin gate permits the realization of an acoustically driven optical polarization modulator based on electron spin transport, a key element for on-chip spin information processing with a photonic interface.

Spin qubits are a platform for quantum computing. There are many advantages for quantum information processing if the spin qubit can move. Here, Helgers et al. use a surface acoustic wave to define a moving quantum dot and demonstrate the magneticfield-free control of the spin precession, bringing “flying” spin qubits a step closer.

Details

Title
Flying electron spin control gates
Author
Helgers, Paul L. J. 1 ; Stotz, James A. H. 2   VIAFID ORCID Logo  ; Sanada, Haruki 3 ; Kunihashi, Yoji 3 ; Biermann, Klaus 4 ; Santos, Paulo V. 4   VIAFID ORCID Logo 

 Paul-Drude-Institut für Festkörperelektronik, Leibniz-Institut im Forschungsverbund Berlin e.V., Berlin, Germany (GRID:grid.420187.8) (ISNI:0000 0000 9119 2714); NTT Basic Research Laboratories, NTT Corporation, Atsugi, Japan (GRID:grid.510989.c) 
 Paul-Drude-Institut für Festkörperelektronik, Leibniz-Institut im Forschungsverbund Berlin e.V., Berlin, Germany (GRID:grid.420187.8) (ISNI:0000 0000 9119 2714); Queen’s University, Department of Physics, Engineering Physics & Astronomy, Kingston, Canada (GRID:grid.410356.5) (ISNI:0000 0004 1936 8331) 
 NTT Basic Research Laboratories, NTT Corporation, Atsugi, Japan (GRID:grid.510989.c) 
 Paul-Drude-Institut für Festkörperelektronik, Leibniz-Institut im Forschungsverbund Berlin e.V., Berlin, Germany (GRID:grid.420187.8) (ISNI:0000 0000 9119 2714) 
Publication year
2022
Publication date
2022
Publisher
Nature Publishing Group
e-ISSN
20411723
Source type
Scholarly Journal
Language of publication
English
ProQuest document ID
2714219196
Copyright
© The Author(s) 2022. This work is published under http://creativecommons.org/licenses/by/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.