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A fast quantum interface between different spin qubit encodings
Single-spin qubits in semiconductor quantum dots hold promise for universal quantum computation with demonstrations of a high single-qubit gate fidelity above 99.9% and two-qubit gates in conjunction with a long coherence time. However, initialization and readout of a qubit is orders of magnitude sl...
Autores principales: | , , , , , , , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group UK
2018
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6265340/ https://www.ncbi.nlm.nih.gov/pubmed/30498231 http://dx.doi.org/10.1038/s41467-018-07522-1 |
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author | Noiri, A. Nakajima, T. Yoneda, J. Delbecq, M. R. Stano, P. Otsuka, T. Takeda, K. Amaha, S. Allison, G. Kawasaki, K. Kojima, Y. Ludwig, A. Wieck, A. D. Loss, D. Tarucha, S. |
author_facet | Noiri, A. Nakajima, T. Yoneda, J. Delbecq, M. R. Stano, P. Otsuka, T. Takeda, K. Amaha, S. Allison, G. Kawasaki, K. Kojima, Y. Ludwig, A. Wieck, A. D. Loss, D. Tarucha, S. |
author_sort | Noiri, A. |
collection | PubMed |
description | Single-spin qubits in semiconductor quantum dots hold promise for universal quantum computation with demonstrations of a high single-qubit gate fidelity above 99.9% and two-qubit gates in conjunction with a long coherence time. However, initialization and readout of a qubit is orders of magnitude slower than control, which is detrimental for implementing measurement-based protocols such as error-correcting codes. In contrast, a singlet-triplet qubit, encoded in a two-spin subspace, has the virtue of fast readout with high fidelity. Here, we present a hybrid system which benefits from the different advantages of these two distinct spin-qubit implementations. A quantum interface between the two codes is realized by electrically tunable inter-qubit exchange coupling. We demonstrate a controlled-phase gate that acts within 5.5 ns, much faster than the measured dephasing time of 211 ns. The presented hybrid architecture will be useful to settle remaining key problems with building scalable spin-based quantum computers. |
format | Online Article Text |
id | pubmed-6265340 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2018 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-62653402018-12-03 A fast quantum interface between different spin qubit encodings Noiri, A. Nakajima, T. Yoneda, J. Delbecq, M. R. Stano, P. Otsuka, T. Takeda, K. Amaha, S. Allison, G. Kawasaki, K. Kojima, Y. Ludwig, A. Wieck, A. D. Loss, D. Tarucha, S. Nat Commun Article Single-spin qubits in semiconductor quantum dots hold promise for universal quantum computation with demonstrations of a high single-qubit gate fidelity above 99.9% and two-qubit gates in conjunction with a long coherence time. However, initialization and readout of a qubit is orders of magnitude slower than control, which is detrimental for implementing measurement-based protocols such as error-correcting codes. In contrast, a singlet-triplet qubit, encoded in a two-spin subspace, has the virtue of fast readout with high fidelity. Here, we present a hybrid system which benefits from the different advantages of these two distinct spin-qubit implementations. A quantum interface between the two codes is realized by electrically tunable inter-qubit exchange coupling. We demonstrate a controlled-phase gate that acts within 5.5 ns, much faster than the measured dephasing time of 211 ns. The presented hybrid architecture will be useful to settle remaining key problems with building scalable spin-based quantum computers. Nature Publishing Group UK 2018-11-29 /pmc/articles/PMC6265340/ /pubmed/30498231 http://dx.doi.org/10.1038/s41467-018-07522-1 Text en © The Author(s) 2018 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 Noiri, A. Nakajima, T. Yoneda, J. Delbecq, M. R. Stano, P. Otsuka, T. Takeda, K. Amaha, S. Allison, G. Kawasaki, K. Kojima, Y. Ludwig, A. Wieck, A. D. Loss, D. Tarucha, S. A fast quantum interface between different spin qubit encodings |
title | A fast quantum interface between different spin qubit encodings |
title_full | A fast quantum interface between different spin qubit encodings |
title_fullStr | A fast quantum interface between different spin qubit encodings |
title_full_unstemmed | A fast quantum interface between different spin qubit encodings |
title_short | A fast quantum interface between different spin qubit encodings |
title_sort | fast quantum interface between different spin qubit encodings |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6265340/ https://www.ncbi.nlm.nih.gov/pubmed/30498231 http://dx.doi.org/10.1038/s41467-018-07522-1 |
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