Toward high-fidelity coherent electron spin transport in a GaAs double quantum dot

Abstract In this paper, we investigate how to achieve high-fidelity electron spin transport in a GaAs double quantum dot. Our study examines fidelity loss in spin transport from multiple perspectives. We first study incoherent fidelity loss due to hyperfine and spin-orbit interaction. We calculate f...

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Autores principales:	Xinyu Zhao, Xuedong Hu
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2018
Materias:	Spin Transport Overhauser Field Fidelity Loss Interdot Spin Relaxation Rate Medicine R Science Q
Acceso en línea:	https://doaj.org/article/7a9c18d01fd94dce9ddb6e74909c8a6e
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spelling	oai:doaj.org-article:7a9c18d01fd94dce9ddb6e74909c8a6e2021-12-02T15:08:17ZToward high-fidelity coherent electron spin transport in a GaAs double quantum dot10.1038/s41598-018-31879-42045-2322https://doaj.org/article/7a9c18d01fd94dce9ddb6e74909c8a6e2018-09-01T00:00:00Zhttps://doi.org/10.1038/s41598-018-31879-4https://doaj.org/toc/2045-2322Abstract In this paper, we investigate how to achieve high-fidelity electron spin transport in a GaAs double quantum dot. Our study examines fidelity loss in spin transport from multiple perspectives. We first study incoherent fidelity loss due to hyperfine and spin-orbit interaction. We calculate fidelity loss due to the random Overhauser field from hyperfine interaction, and spin relaxation rate due to spin-orbit interaction in a wide range of experimental parameters with a focus on the occurrence of spin hot spots. A safe parameter regime is identified in order to avoid these spin hot spots. We then analyze systematic errors due to non-adiabatic transitions in the Landau-Zener process of sweeping the interdot detuning, and propose a scheme to take advantage of possible Landau-Zener-Stückelberg interference to achieve high-fidelity spin transport at a higher speed. At last, we study another systematic error caused by the correction to the electron g-factor from the double dot potential, which can lead to a notable phase error. In all, our results should provide a useful guidance for future experiments on coherent electron spin transport.Xinyu ZhaoXuedong HuNature PortfolioarticleSpin TransportOverhauser FieldFidelity LossInterdotSpin Relaxation RateMedicineRScienceQENScientific Reports, Vol 8, Iss 1, Pp 1-15 (2018)
institution	DOAJ
collection	DOAJ
language	EN
topic	Spin Transport Overhauser Field Fidelity Loss Interdot Spin Relaxation Rate Medicine R Science Q
spellingShingle	Spin Transport Overhauser Field Fidelity Loss Interdot Spin Relaxation Rate Medicine R Science Q Xinyu Zhao Xuedong Hu Toward high-fidelity coherent electron spin transport in a GaAs double quantum dot
description	Abstract In this paper, we investigate how to achieve high-fidelity electron spin transport in a GaAs double quantum dot. Our study examines fidelity loss in spin transport from multiple perspectives. We first study incoherent fidelity loss due to hyperfine and spin-orbit interaction. We calculate fidelity loss due to the random Overhauser field from hyperfine interaction, and spin relaxation rate due to spin-orbit interaction in a wide range of experimental parameters with a focus on the occurrence of spin hot spots. A safe parameter regime is identified in order to avoid these spin hot spots. We then analyze systematic errors due to non-adiabatic transitions in the Landau-Zener process of sweeping the interdot detuning, and propose a scheme to take advantage of possible Landau-Zener-Stückelberg interference to achieve high-fidelity spin transport at a higher speed. At last, we study another systematic error caused by the correction to the electron g-factor from the double dot potential, which can lead to a notable phase error. In all, our results should provide a useful guidance for future experiments on coherent electron spin transport.
format	article
author	Xinyu Zhao Xuedong Hu
author_facet	Xinyu Zhao Xuedong Hu
author_sort	Xinyu Zhao
title	Toward high-fidelity coherent electron spin transport in a GaAs double quantum dot
title_short	Toward high-fidelity coherent electron spin transport in a GaAs double quantum dot
title_full	Toward high-fidelity coherent electron spin transport in a GaAs double quantum dot
title_fullStr	Toward high-fidelity coherent electron spin transport in a GaAs double quantum dot
title_full_unstemmed	Toward high-fidelity coherent electron spin transport in a GaAs double quantum dot
title_sort	toward high-fidelity coherent electron spin transport in a gaas double quantum dot
publisher	Nature Portfolio
publishDate	2018
url	https://doaj.org/article/7a9c18d01fd94dce9ddb6e74909c8a6e
work_keys_str_mv	AT xinyuzhao towardhighfidelitycoherentelectronspintransportinagaasdoublequantumdot AT xuedonghu towardhighfidelitycoherentelectronspintransportinagaasdoublequantumdot
_version_	1718388195739041792

Toward high-fidelity coherent electron spin transport in a GaAs double quantum dot

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