Demonstrating the power of quantum computers, certification of highly entangled measurements and scalable quantum nonlocality

Abstract Increasingly sophisticated quantum computers motivate the exploration of their abilities in certifying genuine quantum phenomena. Here, we demonstrate the power of state-of-the-art IBM quantum computers in correlation experiments inspired by quantum networks. Our experiments feature up to 1...

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Autores principales:	Elisa Bäumer, Nicolas Gisin, Armin Tavakoli
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/e17273afb4d74aeaba1c8670afdcea25
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spelling	oai:doaj.org-article:e17273afb4d74aeaba1c8670afdcea252021-12-02T16:26:28ZDemonstrating the power of quantum computers, certification of highly entangled measurements and scalable quantum nonlocality10.1038/s41534-021-00450-x2056-6387https://doaj.org/article/e17273afb4d74aeaba1c8670afdcea252021-07-01T00:00:00Zhttps://doi.org/10.1038/s41534-021-00450-xhttps://doaj.org/toc/2056-6387Abstract Increasingly sophisticated quantum computers motivate the exploration of their abilities in certifying genuine quantum phenomena. Here, we demonstrate the power of state-of-the-art IBM quantum computers in correlation experiments inspired by quantum networks. Our experiments feature up to 12 qubits and require the implementation of paradigmatic Bell-State Measurements for scalable entanglement-swapping. First, we demonstrate quantum correlations that defy classical models in up to nine-qubit systems while only assuming that the quantum computer operates on qubits. Harvesting these quantum advantages, we are able to certify 82 basis elements as entangled in a 512-outcome measurement. Then, we relax the qubit assumption and consider quantum nonlocality in a scenario with multiple independent entangled states arranged in a star configuration. We report quantum violations of source-independent Bell inequalities for up to ten qubits. Our results demonstrate the ability of quantum computers to outperform classical limitations and certify scalable entangled measurements.Elisa BäumerNicolas GisinArmin TavakoliNature PortfolioarticlePhysicsQC1-999Electronic computers. Computer scienceQA75.5-76.95ENnpj Quantum Information, Vol 7, Iss 1, Pp 1-6 (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 Elisa Bäumer Nicolas Gisin Armin Tavakoli Demonstrating the power of quantum computers, certification of highly entangled measurements and scalable quantum nonlocality
description	Abstract Increasingly sophisticated quantum computers motivate the exploration of their abilities in certifying genuine quantum phenomena. Here, we demonstrate the power of state-of-the-art IBM quantum computers in correlation experiments inspired by quantum networks. Our experiments feature up to 12 qubits and require the implementation of paradigmatic Bell-State Measurements for scalable entanglement-swapping. First, we demonstrate quantum correlations that defy classical models in up to nine-qubit systems while only assuming that the quantum computer operates on qubits. Harvesting these quantum advantages, we are able to certify 82 basis elements as entangled in a 512-outcome measurement. Then, we relax the qubit assumption and consider quantum nonlocality in a scenario with multiple independent entangled states arranged in a star configuration. We report quantum violations of source-independent Bell inequalities for up to ten qubits. Our results demonstrate the ability of quantum computers to outperform classical limitations and certify scalable entangled measurements.
format	article
author	Elisa Bäumer Nicolas Gisin Armin Tavakoli
author_facet	Elisa Bäumer Nicolas Gisin Armin Tavakoli
author_sort	Elisa Bäumer
title	Demonstrating the power of quantum computers, certification of highly entangled measurements and scalable quantum nonlocality
title_short	Demonstrating the power of quantum computers, certification of highly entangled measurements and scalable quantum nonlocality
title_full	Demonstrating the power of quantum computers, certification of highly entangled measurements and scalable quantum nonlocality
title_fullStr	Demonstrating the power of quantum computers, certification of highly entangled measurements and scalable quantum nonlocality
title_full_unstemmed	Demonstrating the power of quantum computers, certification of highly entangled measurements and scalable quantum nonlocality
title_sort	demonstrating the power of quantum computers, certification of highly entangled measurements and scalable quantum nonlocality
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/e17273afb4d74aeaba1c8670afdcea25
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Demonstrating the power of quantum computers, certification of highly entangled measurements and scalable quantum nonlocality

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