Generation, characterization, and manipulation of quantum correlations in electron beams

Abstract Entanglement engineering plays a central role in quantum-enhanced technologies, with potential physical platforms that outperform their classical counterparts. However, free electrons remain largely unexplored despite their great capacity to encode and manipulate quantum information, due in...

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Autores principales:	Shahaf Asban, F. Javier García de Abajo
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/dfa79fed358944eda1c92ae21dacea4e
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spelling	oai:doaj.org-article:dfa79fed358944eda1c92ae21dacea4e2021-12-02T13:34:34ZGeneration, characterization, and manipulation of quantum correlations in electron beams10.1038/s41534-021-00376-42056-6387https://doaj.org/article/dfa79fed358944eda1c92ae21dacea4e2021-02-01T00:00:00Zhttps://doi.org/10.1038/s41534-021-00376-4https://doaj.org/toc/2056-6387Abstract Entanglement engineering plays a central role in quantum-enhanced technologies, with potential physical platforms that outperform their classical counterparts. However, free electrons remain largely unexplored despite their great capacity to encode and manipulate quantum information, due in part to the lack of a suitable theoretical framework. Here we link theoretical concepts from quantum information to available free-electron sources. Specifically, we consider the interactions among electrons propagating near the surface of a polariton-supporting medium and study the entanglement induced by pair-wise coupling. These correlations depend on the controlled interaction interval and the initial electron bandwidth. We show that long interaction times of broadband electrons extend their temporal coherence. This in turn is revealed through a widened Hong–Ou–Mandel peak and is associated with an increased entanglement entropy. We then introduce a discrete basis of electronic temporal modes and discriminate between them via coincidence detection with a shaped probe. This paves the way for ultrafast quantum information transfer by means of free electrons, rendering the large alphabet that they span in the time domain accessible.Shahaf AsbanF. Javier García de AbajoNature 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 Shahaf Asban F. Javier García de Abajo Generation, characterization, and manipulation of quantum correlations in electron beams
description	Abstract Entanglement engineering plays a central role in quantum-enhanced technologies, with potential physical platforms that outperform their classical counterparts. However, free electrons remain largely unexplored despite their great capacity to encode and manipulate quantum information, due in part to the lack of a suitable theoretical framework. Here we link theoretical concepts from quantum information to available free-electron sources. Specifically, we consider the interactions among electrons propagating near the surface of a polariton-supporting medium and study the entanglement induced by pair-wise coupling. These correlations depend on the controlled interaction interval and the initial electron bandwidth. We show that long interaction times of broadband electrons extend their temporal coherence. This in turn is revealed through a widened Hong–Ou–Mandel peak and is associated with an increased entanglement entropy. We then introduce a discrete basis of electronic temporal modes and discriminate between them via coincidence detection with a shaped probe. This paves the way for ultrafast quantum information transfer by means of free electrons, rendering the large alphabet that they span in the time domain accessible.
format	article
author	Shahaf Asban F. Javier García de Abajo
author_facet	Shahaf Asban F. Javier García de Abajo
author_sort	Shahaf Asban
title	Generation, characterization, and manipulation of quantum correlations in electron beams
title_short	Generation, characterization, and manipulation of quantum correlations in electron beams
title_full	Generation, characterization, and manipulation of quantum correlations in electron beams
title_fullStr	Generation, characterization, and manipulation of quantum correlations in electron beams
title_full_unstemmed	Generation, characterization, and manipulation of quantum correlations in electron beams
title_sort	generation, characterization, and manipulation of quantum correlations in electron beams
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/dfa79fed358944eda1c92ae21dacea4e
work_keys_str_mv	AT shahafasban generationcharacterizationandmanipulationofquantumcorrelationsinelectronbeams AT fjaviergarciadeabajo generationcharacterizationandmanipulationofquantumcorrelationsinelectronbeams
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Generation, characterization, and manipulation of quantum correlations in electron beams

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