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Beating the break-even point with a discrete-variable-encoded logical qubit
Quantum error correction (QEC) aims to protect logical qubits from noises by using the redundancy of a large Hilbert space, which allows errors to be detected and corrected in real time(1). In most QEC codes(2–8), a logical qubit is encoded in some discrete variables, for example photon numbers, so...
Autores principales: | , , , , , , , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group UK
2023
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10076216/ https://www.ncbi.nlm.nih.gov/pubmed/36949191 http://dx.doi.org/10.1038/s41586-023-05784-4 |
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author | Ni, Zhongchu Li, Sai Deng, Xiaowei Cai, Yanyan Zhang, Libo Wang, Weiting Yang, Zhen-Biao Yu, Haifeng Yan, Fei Liu, Song Zou, Chang-Ling Sun, Luyan Zheng, Shi-Biao Xu, Yuan Yu, Dapeng |
author_facet | Ni, Zhongchu Li, Sai Deng, Xiaowei Cai, Yanyan Zhang, Libo Wang, Weiting Yang, Zhen-Biao Yu, Haifeng Yan, Fei Liu, Song Zou, Chang-Ling Sun, Luyan Zheng, Shi-Biao Xu, Yuan Yu, Dapeng |
author_sort | Ni, Zhongchu |
collection | PubMed |
description | Quantum error correction (QEC) aims to protect logical qubits from noises by using the redundancy of a large Hilbert space, which allows errors to be detected and corrected in real time(1). In most QEC codes(2–8), a logical qubit is encoded in some discrete variables, for example photon numbers, so that the encoded quantum information can be unambiguously extracted after processing. Over the past decade, repetitive QEC has been demonstrated with various discrete-variable-encoded scenarios(9–17). However, extending the lifetimes of thus-encoded logical qubits beyond the best available physical qubit still remains elusive, which represents a break-even point for judging the practical usefulness of QEC. Here we demonstrate a QEC procedure in a circuit quantum electrodynamics architecture(18), where the logical qubit is binomially encoded in photon-number states of a microwave cavity(8), dispersively coupled to an auxiliary superconducting qubit. By applying a pulse featuring a tailored frequency comb to the auxiliary qubit, we can repetitively extract the error syndrome with high fidelity and perform error correction with feedback control accordingly, thereby exceeding the break-even point by about 16% lifetime enhancement. Our work illustrates the potential of hardware-efficient discrete-variable encodings for fault-tolerant quantum computation(19). |
format | Online Article Text |
id | pubmed-10076216 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2023 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-100762162023-04-07 Beating the break-even point with a discrete-variable-encoded logical qubit Ni, Zhongchu Li, Sai Deng, Xiaowei Cai, Yanyan Zhang, Libo Wang, Weiting Yang, Zhen-Biao Yu, Haifeng Yan, Fei Liu, Song Zou, Chang-Ling Sun, Luyan Zheng, Shi-Biao Xu, Yuan Yu, Dapeng Nature Article Quantum error correction (QEC) aims to protect logical qubits from noises by using the redundancy of a large Hilbert space, which allows errors to be detected and corrected in real time(1). In most QEC codes(2–8), a logical qubit is encoded in some discrete variables, for example photon numbers, so that the encoded quantum information can be unambiguously extracted after processing. Over the past decade, repetitive QEC has been demonstrated with various discrete-variable-encoded scenarios(9–17). However, extending the lifetimes of thus-encoded logical qubits beyond the best available physical qubit still remains elusive, which represents a break-even point for judging the practical usefulness of QEC. Here we demonstrate a QEC procedure in a circuit quantum electrodynamics architecture(18), where the logical qubit is binomially encoded in photon-number states of a microwave cavity(8), dispersively coupled to an auxiliary superconducting qubit. By applying a pulse featuring a tailored frequency comb to the auxiliary qubit, we can repetitively extract the error syndrome with high fidelity and perform error correction with feedback control accordingly, thereby exceeding the break-even point by about 16% lifetime enhancement. Our work illustrates the potential of hardware-efficient discrete-variable encodings for fault-tolerant quantum computation(19). Nature Publishing Group UK 2023-03-22 2023 /pmc/articles/PMC10076216/ /pubmed/36949191 http://dx.doi.org/10.1038/s41586-023-05784-4 Text en © The Author(s) 2023 https://creativecommons.org/licenses/by/4.0/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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) . |
spellingShingle | Article Ni, Zhongchu Li, Sai Deng, Xiaowei Cai, Yanyan Zhang, Libo Wang, Weiting Yang, Zhen-Biao Yu, Haifeng Yan, Fei Liu, Song Zou, Chang-Ling Sun, Luyan Zheng, Shi-Biao Xu, Yuan Yu, Dapeng Beating the break-even point with a discrete-variable-encoded logical qubit |
title | Beating the break-even point with a discrete-variable-encoded logical qubit |
title_full | Beating the break-even point with a discrete-variable-encoded logical qubit |
title_fullStr | Beating the break-even point with a discrete-variable-encoded logical qubit |
title_full_unstemmed | Beating the break-even point with a discrete-variable-encoded logical qubit |
title_short | Beating the break-even point with a discrete-variable-encoded logical qubit |
title_sort | beating the break-even point with a discrete-variable-encoded logical qubit |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10076216/ https://www.ncbi.nlm.nih.gov/pubmed/36949191 http://dx.doi.org/10.1038/s41586-023-05784-4 |
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