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Controllable freezing of the nuclear spin bath in a single-atom spin qubit
The quantum coherence and gate fidelity of electron spin qubits in semiconductors are often limited by nuclear spin fluctuations. Enrichment of spin-zero isotopes in silicon markedly improves the dephasing time [Formula: see text] , which, unexpectedly, can extend two orders of magnitude beyond theo...
Autores principales: | , , , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
American Association for the Advancement of Science
2020
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7458445/ https://www.ncbi.nlm.nih.gov/pubmed/32937454 http://dx.doi.org/10.1126/sciadv.aba3442 |
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author | Mądzik, Mateusz T. Ladd, Thaddeus D. Hudson, Fay E. Itoh, Kohei M. Jakob, Alexander M. Johnson, Brett C. McCallum, Jeffrey C. Jamieson, David N. Dzurak, Andrew S. Laucht, Arne Morello, Andrea |
author_facet | Mądzik, Mateusz T. Ladd, Thaddeus D. Hudson, Fay E. Itoh, Kohei M. Jakob, Alexander M. Johnson, Brett C. McCallum, Jeffrey C. Jamieson, David N. Dzurak, Andrew S. Laucht, Arne Morello, Andrea |
author_sort | Mądzik, Mateusz T. |
collection | PubMed |
description | The quantum coherence and gate fidelity of electron spin qubits in semiconductors are often limited by nuclear spin fluctuations. Enrichment of spin-zero isotopes in silicon markedly improves the dephasing time [Formula: see text] , which, unexpectedly, can extend two orders of magnitude beyond theoretical expectations. Using a single-atom (31)P qubit in enriched (28)Si, we show that the abnormally long [Formula: see text] is due to the freezing of the dynamics of the residual (29)Si nuclei, caused by the electron-nuclear hyperfine interaction. Inserting a waiting period when the electron is controllably removed unfreezes the nuclear dynamics and restores the ergodic [Formula: see text] value. Our conclusions are supported by a nearly parameter-free modeling of the (29)Si nuclear spin dynamics, which reveals the degree of backaction provided by the electron spin. This study clarifies the limits of ergodic assumptions in nuclear bath dynamics and provides previously unidentified strategies for maximizing coherence and gate fidelity of spin qubits in semiconductors. |
format | Online Article Text |
id | pubmed-7458445 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2020 |
publisher | American Association for the Advancement of Science |
record_format | MEDLINE/PubMed |
spelling | pubmed-74584452020-09-16 Controllable freezing of the nuclear spin bath in a single-atom spin qubit Mądzik, Mateusz T. Ladd, Thaddeus D. Hudson, Fay E. Itoh, Kohei M. Jakob, Alexander M. Johnson, Brett C. McCallum, Jeffrey C. Jamieson, David N. Dzurak, Andrew S. Laucht, Arne Morello, Andrea Sci Adv Research Articles The quantum coherence and gate fidelity of electron spin qubits in semiconductors are often limited by nuclear spin fluctuations. Enrichment of spin-zero isotopes in silicon markedly improves the dephasing time [Formula: see text] , which, unexpectedly, can extend two orders of magnitude beyond theoretical expectations. Using a single-atom (31)P qubit in enriched (28)Si, we show that the abnormally long [Formula: see text] is due to the freezing of the dynamics of the residual (29)Si nuclei, caused by the electron-nuclear hyperfine interaction. Inserting a waiting period when the electron is controllably removed unfreezes the nuclear dynamics and restores the ergodic [Formula: see text] value. Our conclusions are supported by a nearly parameter-free modeling of the (29)Si nuclear spin dynamics, which reveals the degree of backaction provided by the electron spin. This study clarifies the limits of ergodic assumptions in nuclear bath dynamics and provides previously unidentified strategies for maximizing coherence and gate fidelity of spin qubits in semiconductors. American Association for the Advancement of Science 2020-07-03 /pmc/articles/PMC7458445/ /pubmed/32937454 http://dx.doi.org/10.1126/sciadv.aba3442 Text en Copyright © 2020 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC). https://creativecommons.org/licenses/by-nc/4.0/ https://creativecommons.org/licenses/by-nc/4.0/This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial license (https://creativecommons.org/licenses/by-nc/4.0/) , which permits use, distribution, and reproduction in any medium, so long as the resultant use is not for commercial advantage and provided the original work is properly cited. |
spellingShingle | Research Articles Mądzik, Mateusz T. Ladd, Thaddeus D. Hudson, Fay E. Itoh, Kohei M. Jakob, Alexander M. Johnson, Brett C. McCallum, Jeffrey C. Jamieson, David N. Dzurak, Andrew S. Laucht, Arne Morello, Andrea Controllable freezing of the nuclear spin bath in a single-atom spin qubit |
title | Controllable freezing of the nuclear spin bath in a single-atom spin qubit |
title_full | Controllable freezing of the nuclear spin bath in a single-atom spin qubit |
title_fullStr | Controllable freezing of the nuclear spin bath in a single-atom spin qubit |
title_full_unstemmed | Controllable freezing of the nuclear spin bath in a single-atom spin qubit |
title_short | Controllable freezing of the nuclear spin bath in a single-atom spin qubit |
title_sort | controllable freezing of the nuclear spin bath in a single-atom spin qubit |
topic | Research Articles |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7458445/ https://www.ncbi.nlm.nih.gov/pubmed/32937454 http://dx.doi.org/10.1126/sciadv.aba3442 |
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