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Conditional rotation of two strongly coupled semiconductor charge qubits
Universal multiple-qubit gates can be implemented by a set of universal single-qubit gates and any one kind of entangling two-qubit gate, such as a controlled-NOT gate. For semiconductor quantum dot qubits, two-qubit gate operations have so far only been demonstrated in individual electron spin-base...
Autores principales: | , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Pub. Group
2015
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4518268/ https://www.ncbi.nlm.nih.gov/pubmed/26184756 http://dx.doi.org/10.1038/ncomms8681 |
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author | Li, Hai-Ou Cao, Gang Yu, Guo-Dong Xiao, Ming Guo, Guang-Can Jiang, Hong-Wen Guo, Guo-Ping |
author_facet | Li, Hai-Ou Cao, Gang Yu, Guo-Dong Xiao, Ming Guo, Guang-Can Jiang, Hong-Wen Guo, Guo-Ping |
author_sort | Li, Hai-Ou |
collection | PubMed |
description | Universal multiple-qubit gates can be implemented by a set of universal single-qubit gates and any one kind of entangling two-qubit gate, such as a controlled-NOT gate. For semiconductor quantum dot qubits, two-qubit gate operations have so far only been demonstrated in individual electron spin-based quantum dot systems. Here we demonstrate the conditional rotation of two capacitively coupled charge qubits, each consisting of an electron confined in a GaAs/AlGaAs double quantum dot. Owing to the strong inter-qubit coupling strength, gate operations with a clock speed up to 6 GHz have been realized. A truth table measurement for controlled-NOT operation shows comparable fidelities to that of spin-based two-qubit gates, although phase coherence is not explicitly measured. Our results suggest that semiconductor charge qubits have a considerable potential for scalable quantum computing and may stimulate the use of long-range Coulomb interaction for coherent quantum control in other devices. |
format | Online Article Text |
id | pubmed-4518268 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2015 |
publisher | Nature Pub. Group |
record_format | MEDLINE/PubMed |
spelling | pubmed-45182682015-08-07 Conditional rotation of two strongly coupled semiconductor charge qubits Li, Hai-Ou Cao, Gang Yu, Guo-Dong Xiao, Ming Guo, Guang-Can Jiang, Hong-Wen Guo, Guo-Ping Nat Commun Article Universal multiple-qubit gates can be implemented by a set of universal single-qubit gates and any one kind of entangling two-qubit gate, such as a controlled-NOT gate. For semiconductor quantum dot qubits, two-qubit gate operations have so far only been demonstrated in individual electron spin-based quantum dot systems. Here we demonstrate the conditional rotation of two capacitively coupled charge qubits, each consisting of an electron confined in a GaAs/AlGaAs double quantum dot. Owing to the strong inter-qubit coupling strength, gate operations with a clock speed up to 6 GHz have been realized. A truth table measurement for controlled-NOT operation shows comparable fidelities to that of spin-based two-qubit gates, although phase coherence is not explicitly measured. Our results suggest that semiconductor charge qubits have a considerable potential for scalable quantum computing and may stimulate the use of long-range Coulomb interaction for coherent quantum control in other devices. Nature Pub. Group 2015-07-17 /pmc/articles/PMC4518268/ /pubmed/26184756 http://dx.doi.org/10.1038/ncomms8681 Text en Copyright © 2015, Nature Publishing Group, a division of Macmillan Publishers Limited. All Rights Reserved. http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article's Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ |
spellingShingle | Article Li, Hai-Ou Cao, Gang Yu, Guo-Dong Xiao, Ming Guo, Guang-Can Jiang, Hong-Wen Guo, Guo-Ping Conditional rotation of two strongly coupled semiconductor charge qubits |
title | Conditional rotation of two strongly coupled semiconductor charge qubits |
title_full | Conditional rotation of two strongly coupled semiconductor charge qubits |
title_fullStr | Conditional rotation of two strongly coupled semiconductor charge qubits |
title_full_unstemmed | Conditional rotation of two strongly coupled semiconductor charge qubits |
title_short | Conditional rotation of two strongly coupled semiconductor charge qubits |
title_sort | conditional rotation of two strongly coupled semiconductor charge qubits |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4518268/ https://www.ncbi.nlm.nih.gov/pubmed/26184756 http://dx.doi.org/10.1038/ncomms8681 |
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