Universal and operational benchmarking of quantum memories

Abstract Quantum memory—the capacity to faithfully preserve quantum coherence and correlations—is essential for quantum-enhanced technology. There is thus a pressing need for operationally meaningful means to benchmark candidate memories across diverse physical platforms. Here we introduce a univers...

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Autores principales:	Xiao Yuan, Yunchao Liu, Qi Zhao, Bartosz Regula, Jayne Thompson, Mile Gu
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Physics QC1-999 Electronic computers. Computer science QA75.5-76.95
Acceso en línea:	https://doaj.org/article/20ab51880b93403b91ebe08a6a67387c
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spelling	oai:doaj.org-article:20ab51880b93403b91ebe08a6a67387c2021-12-02T16:14:02ZUniversal and operational benchmarking of quantum memories10.1038/s41534-021-00444-92056-6387https://doaj.org/article/20ab51880b93403b91ebe08a6a67387c2021-07-01T00:00:00Zhttps://doi.org/10.1038/s41534-021-00444-9https://doaj.org/toc/2056-6387Abstract Quantum memory—the capacity to faithfully preserve quantum coherence and correlations—is essential for quantum-enhanced technology. There is thus a pressing need for operationally meaningful means to benchmark candidate memories across diverse physical platforms. Here we introduce a universal benchmark distinguished by its relevance across multiple key operational settings, exactly quantifying (1) the memory’s robustness to noise, (2) the number of noiseless qubits needed for its synthesis, (3) its potential to speed up statistical sampling tasks, and (4) performance advantage in non-local games beyond classical limits. The measure is analytically computable for low-dimensional systems and can be efficiently bounded in the experiment without tomography. We thus illustrate quantum memory as a meaningful resource, with our benchmark reflecting both its cost of creation and what it can accomplish. We demonstrate the benchmark on the five-qubit IBM Q hardware, and apply it to witness the efficacy of error-suppression techniques and quantify non-Markovian noise. We thus present an experimentally accessible, practically meaningful, and universally relevant quantifier of a memory’s capability to preserve quantum advantage.Xiao YuanYunchao LiuQi ZhaoBartosz RegulaJayne ThompsonMile GuNature PortfolioarticlePhysicsQC1-999Electronic computers. Computer scienceQA75.5-76.95ENnpj Quantum Information, Vol 7, Iss 1, Pp 1-8 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Physics QC1-999 Electronic computers. Computer science QA75.5-76.95
spellingShingle	Physics QC1-999 Electronic computers. Computer science QA75.5-76.95 Xiao Yuan Yunchao Liu Qi Zhao Bartosz Regula Jayne Thompson Mile Gu Universal and operational benchmarking of quantum memories
description	Abstract Quantum memory—the capacity to faithfully preserve quantum coherence and correlations—is essential for quantum-enhanced technology. There is thus a pressing need for operationally meaningful means to benchmark candidate memories across diverse physical platforms. Here we introduce a universal benchmark distinguished by its relevance across multiple key operational settings, exactly quantifying (1) the memory’s robustness to noise, (2) the number of noiseless qubits needed for its synthesis, (3) its potential to speed up statistical sampling tasks, and (4) performance advantage in non-local games beyond classical limits. The measure is analytically computable for low-dimensional systems and can be efficiently bounded in the experiment without tomography. We thus illustrate quantum memory as a meaningful resource, with our benchmark reflecting both its cost of creation and what it can accomplish. We demonstrate the benchmark on the five-qubit IBM Q hardware, and apply it to witness the efficacy of error-suppression techniques and quantify non-Markovian noise. We thus present an experimentally accessible, practically meaningful, and universally relevant quantifier of a memory’s capability to preserve quantum advantage.
format	article
author	Xiao Yuan Yunchao Liu Qi Zhao Bartosz Regula Jayne Thompson Mile Gu
author_facet	Xiao Yuan Yunchao Liu Qi Zhao Bartosz Regula Jayne Thompson Mile Gu
author_sort	Xiao Yuan
title	Universal and operational benchmarking of quantum memories
title_short	Universal and operational benchmarking of quantum memories
title_full	Universal and operational benchmarking of quantum memories
title_fullStr	Universal and operational benchmarking of quantum memories
title_full_unstemmed	Universal and operational benchmarking of quantum memories
title_sort	universal and operational benchmarking of quantum memories
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/20ab51880b93403b91ebe08a6a67387c
work_keys_str_mv	AT xiaoyuan universalandoperationalbenchmarkingofquantummemories AT yunchaoliu universalandoperationalbenchmarkingofquantummemories AT qizhao universalandoperationalbenchmarkingofquantummemories AT bartoszregula universalandoperationalbenchmarkingofquantummemories AT jaynethompson universalandoperationalbenchmarkingofquantummemories AT milegu universalandoperationalbenchmarkingofquantummemories
_version_	1718384338540691456

Universal and operational benchmarking of quantum memories

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