Beyond the standard quantum limit for parametric amplification of broadband signals

Abstract The low-noise amplification of weak microwave signals is crucial for countless protocols in quantum information processing. Quantum mechanics sets an ultimate lower limit of half a photon to the added input noise for phase-preserving amplification of narrowband signals, also known as the st...

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Autores principales:	M. Renger, S. Pogorzalek, Q. Chen, Y. Nojiri, K. Inomata, Y. Nakamura, M. Partanen, A. Marx, R. Gross, F. Deppe, K. G. Fedorov
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/3bd1f2b588c34a088b8a3a8a3cc5738f
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spelling	oai:doaj.org-article:3bd1f2b588c34a088b8a3a8a3cc5738f2021-11-14T12:15:41ZBeyond the standard quantum limit for parametric amplification of broadband signals10.1038/s41534-021-00495-y2056-6387https://doaj.org/article/3bd1f2b588c34a088b8a3a8a3cc5738f2021-11-01T00:00:00Zhttps://doi.org/10.1038/s41534-021-00495-yhttps://doaj.org/toc/2056-6387Abstract The low-noise amplification of weak microwave signals is crucial for countless protocols in quantum information processing. Quantum mechanics sets an ultimate lower limit of half a photon to the added input noise for phase-preserving amplification of narrowband signals, also known as the standard quantum limit (SQL). This limit, which is equivalent to a maximum quantum efficiency of 0.5, can be overcome by employing nondegenerate parametric amplification of broadband signals. We show that, in principle, a maximum quantum efficiency of unity can be reached. Experimentally, we find a quantum efficiency of 0.69 ± 0.02, well beyond the SQL, by employing a flux-driven Josephson parametric amplifier and broadband thermal signals. We expect that our results allow for fundamental improvements in the detection of ultraweak microwave signals.M. RengerS. PogorzalekQ. ChenY. NojiriK. InomataY. NakamuraM. PartanenA. MarxR. GrossF. DeppeK. G. FedorovNature PortfolioarticlePhysicsQC1-999Electronic computers. Computer scienceQA75.5-76.95ENnpj Quantum Information, Vol 7, Iss 1, Pp 1-7 (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 M. Renger S. Pogorzalek Q. Chen Y. Nojiri K. Inomata Y. Nakamura M. Partanen A. Marx R. Gross F. Deppe K. G. Fedorov Beyond the standard quantum limit for parametric amplification of broadband signals
description	Abstract The low-noise amplification of weak microwave signals is crucial for countless protocols in quantum information processing. Quantum mechanics sets an ultimate lower limit of half a photon to the added input noise for phase-preserving amplification of narrowband signals, also known as the standard quantum limit (SQL). This limit, which is equivalent to a maximum quantum efficiency of 0.5, can be overcome by employing nondegenerate parametric amplification of broadband signals. We show that, in principle, a maximum quantum efficiency of unity can be reached. Experimentally, we find a quantum efficiency of 0.69 ± 0.02, well beyond the SQL, by employing a flux-driven Josephson parametric amplifier and broadband thermal signals. We expect that our results allow for fundamental improvements in the detection of ultraweak microwave signals.
format	article
author	M. Renger S. Pogorzalek Q. Chen Y. Nojiri K. Inomata Y. Nakamura M. Partanen A. Marx R. Gross F. Deppe K. G. Fedorov
author_facet	M. Renger S. Pogorzalek Q. Chen Y. Nojiri K. Inomata Y. Nakamura M. Partanen A. Marx R. Gross F. Deppe K. G. Fedorov
author_sort	M. Renger
title	Beyond the standard quantum limit for parametric amplification of broadband signals
title_short	Beyond the standard quantum limit for parametric amplification of broadband signals
title_full	Beyond the standard quantum limit for parametric amplification of broadband signals
title_fullStr	Beyond the standard quantum limit for parametric amplification of broadband signals
title_full_unstemmed	Beyond the standard quantum limit for parametric amplification of broadband signals
title_sort	beyond the standard quantum limit for parametric amplification of broadband signals
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/3bd1f2b588c34a088b8a3a8a3cc5738f
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Beyond the standard quantum limit for parametric amplification of broadband signals

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