Suppression of nuclear spin fluctuations in an InGaAs quantum dot ensemble by GHz-pulsed optical excitation

Abstract The coherent electron spin dynamics of an ensemble of singly charged (In,Ga)As/GaAs quantum dots in a transverse magnetic field is driven by periodic optical excitation at 1 GHz repetition frequency. Despite the strong inhomogeneity of the electron g factor, the spectral spread of optical t...

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Autores principales:	E. Evers, N. E. Kopteva, I. A. Yugova, D. R. Yakovlev, D. Reuter, A. D. Wieck, M. Bayer, A. Greilich
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Physics QC1-999 Electronic computers. Computer science QA75.5-76.95
Acceso en línea:	https://doaj.org/article/4ae10e0df4fb48c1b4487c5438c33f00
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spelling	oai:doaj.org-article:4ae10e0df4fb48c1b4487c5438c33f002021-12-02T15:51:19ZSuppression of nuclear spin fluctuations in an InGaAs quantum dot ensemble by GHz-pulsed optical excitation10.1038/s41534-021-00395-12056-6387https://doaj.org/article/4ae10e0df4fb48c1b4487c5438c33f002021-04-01T00:00:00Zhttps://doi.org/10.1038/s41534-021-00395-1https://doaj.org/toc/2056-6387Abstract The coherent electron spin dynamics of an ensemble of singly charged (In,Ga)As/GaAs quantum dots in a transverse magnetic field is driven by periodic optical excitation at 1 GHz repetition frequency. Despite the strong inhomogeneity of the electron g factor, the spectral spread of optical transitions, and the broad distribution of nuclear spin fluctuations, we are able to push the whole ensemble of excited spins into a single Larmor precession mode that is commensurate with the laser repetition frequency. Furthermore, we demonstrate that an optical detuning of the pump pulses from the probed optical transitions induces a directed dynamic nuclear polarization and leads to a discretization of the total magnetic field acting on the electron ensemble. Finally, we show that the highly periodic optical excitation can be used as universal tool for strongly reducing the nuclear spin fluctuations and preparation of a robust nuclear environment for subsequent manipulation of the electron spins, also at varying operation frequencies.E. EversN. E. KoptevaI. A. YugovaD. R. YakovlevD. ReuterA. D. WieckM. BayerA. GreilichNature PortfolioarticlePhysicsQC1-999Electronic computers. Computer scienceQA75.5-76.95ENnpj Quantum Information, Vol 7, Iss 1, Pp 1-7 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Physics QC1-999 Electronic computers. Computer science QA75.5-76.95
spellingShingle	Physics QC1-999 Electronic computers. Computer science QA75.5-76.95 E. Evers N. E. Kopteva I. A. Yugova D. R. Yakovlev D. Reuter A. D. Wieck M. Bayer A. Greilich Suppression of nuclear spin fluctuations in an InGaAs quantum dot ensemble by GHz-pulsed optical excitation
description	Abstract The coherent electron spin dynamics of an ensemble of singly charged (In,Ga)As/GaAs quantum dots in a transverse magnetic field is driven by periodic optical excitation at 1 GHz repetition frequency. Despite the strong inhomogeneity of the electron g factor, the spectral spread of optical transitions, and the broad distribution of nuclear spin fluctuations, we are able to push the whole ensemble of excited spins into a single Larmor precession mode that is commensurate with the laser repetition frequency. Furthermore, we demonstrate that an optical detuning of the pump pulses from the probed optical transitions induces a directed dynamic nuclear polarization and leads to a discretization of the total magnetic field acting on the electron ensemble. Finally, we show that the highly periodic optical excitation can be used as universal tool for strongly reducing the nuclear spin fluctuations and preparation of a robust nuclear environment for subsequent manipulation of the electron spins, also at varying operation frequencies.
format	article
author	E. Evers N. E. Kopteva I. A. Yugova D. R. Yakovlev D. Reuter A. D. Wieck M. Bayer A. Greilich
author_facet	E. Evers N. E. Kopteva I. A. Yugova D. R. Yakovlev D. Reuter A. D. Wieck M. Bayer A. Greilich
author_sort	E. Evers
title	Suppression of nuclear spin fluctuations in an InGaAs quantum dot ensemble by GHz-pulsed optical excitation
title_short	Suppression of nuclear spin fluctuations in an InGaAs quantum dot ensemble by GHz-pulsed optical excitation
title_full	Suppression of nuclear spin fluctuations in an InGaAs quantum dot ensemble by GHz-pulsed optical excitation
title_fullStr	Suppression of nuclear spin fluctuations in an InGaAs quantum dot ensemble by GHz-pulsed optical excitation
title_full_unstemmed	Suppression of nuclear spin fluctuations in an InGaAs quantum dot ensemble by GHz-pulsed optical excitation
title_sort	suppression of nuclear spin fluctuations in an ingaas quantum dot ensemble by ghz-pulsed optical excitation
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/4ae10e0df4fb48c1b4487c5438c33f00
work_keys_str_mv	AT eevers suppressionofnuclearspinfluctuationsinaningaasquantumdotensemblebyghzpulsedopticalexcitation AT nekopteva suppressionofnuclearspinfluctuationsinaningaasquantumdotensemblebyghzpulsedopticalexcitation AT iayugova suppressionofnuclearspinfluctuationsinaningaasquantumdotensemblebyghzpulsedopticalexcitation AT dryakovlev suppressionofnuclearspinfluctuationsinaningaasquantumdotensemblebyghzpulsedopticalexcitation AT dreuter suppressionofnuclearspinfluctuationsinaningaasquantumdotensemblebyghzpulsedopticalexcitation AT adwieck suppressionofnuclearspinfluctuationsinaningaasquantumdotensemblebyghzpulsedopticalexcitation AT mbayer suppressionofnuclearspinfluctuationsinaningaasquantumdotensemblebyghzpulsedopticalexcitation AT agreilich suppressionofnuclearspinfluctuationsinaningaasquantumdotensemblebyghzpulsedopticalexcitation
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Suppression of nuclear spin fluctuations in an InGaAs quantum dot ensemble by GHz-pulsed optical excitation

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