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Fully Tunable Hyperfine Interactions of Hole Spin Qubits in Si and Ge Quantum Dots
JournalArticle (Originalarbeit in einer wissenschaftlichen Zeitschrift)
 
ID 4640928
Author(s) Bosco, Stefano; Loss, Daniel
Author(s) at UniBasel Loss, Daniel
Year 2021
Title Fully Tunable Hyperfine Interactions of Hole Spin Qubits in Si and Ge Quantum Dots
Journal Physical Review Letters
Volume 127
Number 19
Pages / Article-Number 190501
Abstract Hole spin qubits are frontrunner platforms for scalable quantum computers, but state-of-the-art devices suffer from noise originating from the hyperfine interactions with nuclear defects. We show that these interactions have a highly tunable anisotropy that is controlled by device design and external electric fields. This tunability enables sweet spots where the hyperfine noise is suppressed by an order of magnitude and is comparable to isotopically purified materials. We identify surprisingly simple designs where the qubits are highly coherent and are largely unaffected by both charge and hyperfine noise. We find that the large spin-orbit interaction typical of elongated quantum dots not only speeds up qubit operations, but also dramatically renormalizes the hyperfine noise, altering qualitatively the dynamics of driven qubits and enhancing the fidelity of qubit gates. Our findings serve as guidelines to design high performance qubits for scaling up quantum computers.
Publisher American Physical Society
ISSN/ISBN 0031-9007 ; 1079-7114
URL https://arxiv.org/pdf/2106.13744.pdf
edoc-URL https://edoc.unibas.ch/87690/
Full Text on edoc No
Digital Object Identifier DOI 10.1103/PhysRevLett.127.190501
PubMed ID http://www.ncbi.nlm.nih.gov/pubmed/34797148
ISI-Number 000717968300001
Document type (ISI) Journal Article
 
   

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