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Coherent spin qubit transport in silicon

A fault-tolerant quantum processor may be configured using stationary qubits interacting only with their nearest neighbours, but at the cost of significant overheads in physical qubits per logical qubit. Such overheads could be reduced by coherently transporting qubits across the chip, allowing conn...

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Detalles Bibliográficos
Autores principales: Yoneda, J., Huang, W., Feng, M., Yang, C. H., Chan, K. W., Tanttu, T., Gilbert, W., Leon, R. C. C., Hudson, F. E., Itoh, K. M., Morello, A., Bartlett, S. D., Laucht, A., Saraiva, A., Dzurak, A. S.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8257656/
https://www.ncbi.nlm.nih.gov/pubmed/34226564
http://dx.doi.org/10.1038/s41467-021-24371-7
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author Yoneda, J.
Huang, W.
Feng, M.
Yang, C. H.
Chan, K. W.
Tanttu, T.
Gilbert, W.
Leon, R. C. C.
Hudson, F. E.
Itoh, K. M.
Morello, A.
Bartlett, S. D.
Laucht, A.
Saraiva, A.
Dzurak, A. S.
author_facet Yoneda, J.
Huang, W.
Feng, M.
Yang, C. H.
Chan, K. W.
Tanttu, T.
Gilbert, W.
Leon, R. C. C.
Hudson, F. E.
Itoh, K. M.
Morello, A.
Bartlett, S. D.
Laucht, A.
Saraiva, A.
Dzurak, A. S.
author_sort Yoneda, J.
collection PubMed
description A fault-tolerant quantum processor may be configured using stationary qubits interacting only with their nearest neighbours, but at the cost of significant overheads in physical qubits per logical qubit. Such overheads could be reduced by coherently transporting qubits across the chip, allowing connectivity beyond immediate neighbours. Here we demonstrate high-fidelity coherent transport of an electron spin qubit between quantum dots in isotopically-enriched silicon. We observe qubit precession in the inter-site tunnelling regime and assess the impact of qubit transport using Ramsey interferometry and quantum state tomography techniques. We report a polarization transfer fidelity of 99.97% and an average coherent transfer fidelity of 99.4%. Our results provide key elements for high-fidelity, on-chip quantum information distribution, as long envisaged, reinforcing the scaling prospects of silicon-based spin qubits.
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spelling pubmed-82576562021-07-23 Coherent spin qubit transport in silicon Yoneda, J. Huang, W. Feng, M. Yang, C. H. Chan, K. W. Tanttu, T. Gilbert, W. Leon, R. C. C. Hudson, F. E. Itoh, K. M. Morello, A. Bartlett, S. D. Laucht, A. Saraiva, A. Dzurak, A. S. Nat Commun Article A fault-tolerant quantum processor may be configured using stationary qubits interacting only with their nearest neighbours, but at the cost of significant overheads in physical qubits per logical qubit. Such overheads could be reduced by coherently transporting qubits across the chip, allowing connectivity beyond immediate neighbours. Here we demonstrate high-fidelity coherent transport of an electron spin qubit between quantum dots in isotopically-enriched silicon. We observe qubit precession in the inter-site tunnelling regime and assess the impact of qubit transport using Ramsey interferometry and quantum state tomography techniques. We report a polarization transfer fidelity of 99.97% and an average coherent transfer fidelity of 99.4%. Our results provide key elements for high-fidelity, on-chip quantum information distribution, as long envisaged, reinforcing the scaling prospects of silicon-based spin qubits. Nature Publishing Group UK 2021-07-05 /pmc/articles/PMC8257656/ /pubmed/34226564 http://dx.doi.org/10.1038/s41467-021-24371-7 Text en © The Author(s) 2021 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) .
spellingShingle Article
Yoneda, J.
Huang, W.
Feng, M.
Yang, C. H.
Chan, K. W.
Tanttu, T.
Gilbert, W.
Leon, R. C. C.
Hudson, F. E.
Itoh, K. M.
Morello, A.
Bartlett, S. D.
Laucht, A.
Saraiva, A.
Dzurak, A. S.
Coherent spin qubit transport in silicon
title Coherent spin qubit transport in silicon
title_full Coherent spin qubit transport in silicon
title_fullStr Coherent spin qubit transport in silicon
title_full_unstemmed Coherent spin qubit transport in silicon
title_short Coherent spin qubit transport in silicon
title_sort coherent spin qubit transport in silicon
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8257656/
https://www.ncbi.nlm.nih.gov/pubmed/34226564
http://dx.doi.org/10.1038/s41467-021-24371-7
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