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Quantum non-demolition readout of an electron spin in silicon

While single-shot detection of silicon spin qubits is now a laboratory routine, the need for quantum error correction in a large-scale quantum computing device demands a quantum non-demolition (QND) implementation. Unlike conventional counterparts, the QND spin readout imposes minimal disturbance to...

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Autores principales: Yoneda, J., Takeda, K., Noiri, A., Nakajima, T., Li, S., Kamioka, J., Kodera, T., Tarucha, S.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7052195/
https://www.ncbi.nlm.nih.gov/pubmed/32123167
http://dx.doi.org/10.1038/s41467-020-14818-8
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author Yoneda, J.
Takeda, K.
Noiri, A.
Nakajima, T.
Li, S.
Kamioka, J.
Kodera, T.
Tarucha, S.
author_facet Yoneda, J.
Takeda, K.
Noiri, A.
Nakajima, T.
Li, S.
Kamioka, J.
Kodera, T.
Tarucha, S.
author_sort Yoneda, J.
collection PubMed
description While single-shot detection of silicon spin qubits is now a laboratory routine, the need for quantum error correction in a large-scale quantum computing device demands a quantum non-demolition (QND) implementation. Unlike conventional counterparts, the QND spin readout imposes minimal disturbance to the probed spin polarization and can therefore be repeated to extinguish measurement errors. Here, we show that an electron spin qubit in silicon can be measured in a highly non-demolition manner by probing another electron spin in a neighboring dot Ising-coupled to the qubit spin. The high non-demolition fidelity (99% on average) enables over 20 readout repetitions of a single spin state, yielding an overall average measurement fidelity of up to 95% within 1.2 ms. We further demonstrate that our repetitive QND readout protocol can realize heralded high-fidelity (>99.6%) ground-state preparation. Our QND-based measurement and preparation, mediated by a second qubit of the same kind, will allow for a wide class of quantum information protocols with electron spins in silicon without compromising the architectural homogeneity.
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spelling pubmed-70521952020-03-04 Quantum non-demolition readout of an electron spin in silicon Yoneda, J. Takeda, K. Noiri, A. Nakajima, T. Li, S. Kamioka, J. Kodera, T. Tarucha, S. Nat Commun Article While single-shot detection of silicon spin qubits is now a laboratory routine, the need for quantum error correction in a large-scale quantum computing device demands a quantum non-demolition (QND) implementation. Unlike conventional counterparts, the QND spin readout imposes minimal disturbance to the probed spin polarization and can therefore be repeated to extinguish measurement errors. Here, we show that an electron spin qubit in silicon can be measured in a highly non-demolition manner by probing another electron spin in a neighboring dot Ising-coupled to the qubit spin. The high non-demolition fidelity (99% on average) enables over 20 readout repetitions of a single spin state, yielding an overall average measurement fidelity of up to 95% within 1.2 ms. We further demonstrate that our repetitive QND readout protocol can realize heralded high-fidelity (>99.6%) ground-state preparation. Our QND-based measurement and preparation, mediated by a second qubit of the same kind, will allow for a wide class of quantum information protocols with electron spins in silicon without compromising the architectural homogeneity. Nature Publishing Group UK 2020-03-02 /pmc/articles/PMC7052195/ /pubmed/32123167 http://dx.doi.org/10.1038/s41467-020-14818-8 Text en © The Author(s) 2020 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
Yoneda, J.
Takeda, K.
Noiri, A.
Nakajima, T.
Li, S.
Kamioka, J.
Kodera, T.
Tarucha, S.
Quantum non-demolition readout of an electron spin in silicon
title Quantum non-demolition readout of an electron spin in silicon
title_full Quantum non-demolition readout of an electron spin in silicon
title_fullStr Quantum non-demolition readout of an electron spin in silicon
title_full_unstemmed Quantum non-demolition readout of an electron spin in silicon
title_short Quantum non-demolition readout of an electron spin in silicon
title_sort quantum non-demolition readout of an electron spin in silicon
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7052195/
https://www.ncbi.nlm.nih.gov/pubmed/32123167
http://dx.doi.org/10.1038/s41467-020-14818-8
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