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Pulse control protocols for preserving coherence in dipolar-coupled nuclear spin baths
Coherence of solid state spin qubits is limited by decoherence and random fluctuations in the spin bath environment. Here we develop spin bath control sequences which simultaneously suppress the fluctuations arising from intrabath interactions and inhomogeneity. Experiments on neutral self-assembled...
Autores principales: | , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group UK
2019
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6637143/ https://www.ncbi.nlm.nih.gov/pubmed/31316057 http://dx.doi.org/10.1038/s41467-019-11160-6 |
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author | Waeber, A. M. Gillard, G. Ragunathan, G. Hopkinson, M. Spencer, P. Ritchie, D. A. Skolnick, M. S. Chekhovich, E. A. |
author_facet | Waeber, A. M. Gillard, G. Ragunathan, G. Hopkinson, M. Spencer, P. Ritchie, D. A. Skolnick, M. S. Chekhovich, E. A. |
author_sort | Waeber, A. M. |
collection | PubMed |
description | Coherence of solid state spin qubits is limited by decoherence and random fluctuations in the spin bath environment. Here we develop spin bath control sequences which simultaneously suppress the fluctuations arising from intrabath interactions and inhomogeneity. Experiments on neutral self-assembled quantum dots yield up to a five-fold increase in coherence of a bare nuclear spin bath. Numerical simulations agree with experiments and reveal emergent thermodynamic behaviour where fluctuations are ultimately caused by irreversible conversion of coherence into many-body quantum entanglement. Simulations show that for homogeneous spin baths our sequences are efficient with non-ideal control pulses, while inhomogeneous bath coherence is inherently limited even under ideal-pulse control, especially for strongly correlated spin-9/2 baths. These results highlight the limitations of self-assembled quantum dots and advantages of strain-free dots, where our sequences can be used to control the fluctuations of a homogeneous nuclear spin bath and potentially improve electron spin qubit coherence. |
format | Online Article Text |
id | pubmed-6637143 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2019 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-66371432019-07-19 Pulse control protocols for preserving coherence in dipolar-coupled nuclear spin baths Waeber, A. M. Gillard, G. Ragunathan, G. Hopkinson, M. Spencer, P. Ritchie, D. A. Skolnick, M. S. Chekhovich, E. A. Nat Commun Article Coherence of solid state spin qubits is limited by decoherence and random fluctuations in the spin bath environment. Here we develop spin bath control sequences which simultaneously suppress the fluctuations arising from intrabath interactions and inhomogeneity. Experiments on neutral self-assembled quantum dots yield up to a five-fold increase in coherence of a bare nuclear spin bath. Numerical simulations agree with experiments and reveal emergent thermodynamic behaviour where fluctuations are ultimately caused by irreversible conversion of coherence into many-body quantum entanglement. Simulations show that for homogeneous spin baths our sequences are efficient with non-ideal control pulses, while inhomogeneous bath coherence is inherently limited even under ideal-pulse control, especially for strongly correlated spin-9/2 baths. These results highlight the limitations of self-assembled quantum dots and advantages of strain-free dots, where our sequences can be used to control the fluctuations of a homogeneous nuclear spin bath and potentially improve electron spin qubit coherence. Nature Publishing Group UK 2019-07-17 /pmc/articles/PMC6637143/ /pubmed/31316057 http://dx.doi.org/10.1038/s41467-019-11160-6 Text en © The Author(s) 2019 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/. |
spellingShingle | Article Waeber, A. M. Gillard, G. Ragunathan, G. Hopkinson, M. Spencer, P. Ritchie, D. A. Skolnick, M. S. Chekhovich, E. A. Pulse control protocols for preserving coherence in dipolar-coupled nuclear spin baths |
title | Pulse control protocols for preserving coherence in dipolar-coupled nuclear spin baths |
title_full | Pulse control protocols for preserving coherence in dipolar-coupled nuclear spin baths |
title_fullStr | Pulse control protocols for preserving coherence in dipolar-coupled nuclear spin baths |
title_full_unstemmed | Pulse control protocols for preserving coherence in dipolar-coupled nuclear spin baths |
title_short | Pulse control protocols for preserving coherence in dipolar-coupled nuclear spin baths |
title_sort | pulse control protocols for preserving coherence in dipolar-coupled nuclear spin baths |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6637143/ https://www.ncbi.nlm.nih.gov/pubmed/31316057 http://dx.doi.org/10.1038/s41467-019-11160-6 |
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