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Self-aligned gates for scalable silicon quantum computing

Geyer, Simon and Camenzind, Leon C. and Czornomaz, Lukas and Deshpande, Veeresh and Fuhrer, Andreas and Warburton, Richard J. and Zumbuhl, Dominik M. and Kuhlmann, Andreas V.. (2021) Self-aligned gates for scalable silicon quantum computing. Applied Physics Letters, 118 (10). p. 104004.

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Official URL: https://edoc.unibas.ch/86163/

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Abstract

Silicon quantum dot spin qubits have great potential for application in large-scale quantum circuits as they share many similarities with conventional transistors that represent the prototypical example for scalable electronic platforms. However, for quantum dot formation and control, additional gates are required, which add to device complexity and, thus, hinder upscaling. Here, we meet this challenge by demonstrating the scalable integration of a multilayer gate stack in silicon quantum dot devices using self-alignment, which allows for ultrasmall gate lengths and intrinsically perfect layer-to-layer alignment. We explore the prospects of these devices as hosts for hole spin qubits that benefit from electrically driven spin control via spin-orbit interaction. Therefore, we study hole transport through a double quantum dot and observe current rectification due to the Pauli spin blockade. The application of a small magnetic field leads to lifting of the spin blockade and reveals the presence of spin-orbit interaction. From the magnitude of a singlet-triplet anticrossing at a high magnetic field, we estimate a spin orbit energy of similar to 37 mu eV, which corresponds to a spin orbit length of similar to 48nm. This work paves the way for scalable spin- based quantum circuits with fast, all-electrical qubit control.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Experimental Physics (Warburton)
05 Faculty of Science > Departement Physik > Physik > Experimentalphysik Quantenphysik (Zumbühl)
UniBasel Contributors:Warburton, Richard J and Zumbühl, Dominik M
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:AIP Publishing
ISSN:0003-6951
e-ISSN:1077-3118
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:11 Apr 2022 12:40
Deposited On:07 Apr 2022 09:49

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