Overcoming detection loss and noise in squeezing-based optical sensing

Abstract Among the known resources of quantum metrology, one of the most practical and efficient is squeezing. Squeezed states of atoms and light improve the sensing of the phase, magnetic field, polarization, mechanical displacement. They promise to considerably increase signal-to-noise ratio in im...

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Autores principales:	Gaetano Frascella, Sascha Agne, Farid Ya. Khalili, Maria V. Chekhova
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/aeb2c2b13b53470ab27c5ee728a9e9af
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spelling	oai:doaj.org-article:aeb2c2b13b53470ab27c5ee728a9e9af2021-12-02T17:15:22ZOvercoming detection loss and noise in squeezing-based optical sensing10.1038/s41534-021-00407-02056-6387https://doaj.org/article/aeb2c2b13b53470ab27c5ee728a9e9af2021-05-01T00:00:00Zhttps://doi.org/10.1038/s41534-021-00407-0https://doaj.org/toc/2056-6387Abstract Among the known resources of quantum metrology, one of the most practical and efficient is squeezing. Squeezed states of atoms and light improve the sensing of the phase, magnetic field, polarization, mechanical displacement. They promise to considerably increase signal-to-noise ratio in imaging and spectroscopy, and are already used in real-life gravitational-wave detectors. But despite being more robust than other states, they are still very fragile, which narrows the scope of their application. In particular, squeezed states are useless in measurements where the detection is inefficient or the noise is high. Here, we experimentally demonstrate a remedy against loss and noise: strong noiseless amplification before detection. This way, we achieve loss-tolerant operation of an interferometer fed with squeezed and coherent light. With only 50% detection efficiency and with noise exceeding the level of squeezed light more than 50 times, we overcome the shot-noise limit by 6 dB. Sub-shot-noise phase sensitivity survives up to 87% loss. Application of this technique to other types of optical sensing and imaging promises a full use of quantum resources in these fields.Gaetano FrascellaSascha AgneFarid Ya. KhaliliMaria V. ChekhovaNature 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 Gaetano Frascella Sascha Agne Farid Ya. Khalili Maria V. Chekhova Overcoming detection loss and noise in squeezing-based optical sensing
description	Abstract Among the known resources of quantum metrology, one of the most practical and efficient is squeezing. Squeezed states of atoms and light improve the sensing of the phase, magnetic field, polarization, mechanical displacement. They promise to considerably increase signal-to-noise ratio in imaging and spectroscopy, and are already used in real-life gravitational-wave detectors. But despite being more robust than other states, they are still very fragile, which narrows the scope of their application. In particular, squeezed states are useless in measurements where the detection is inefficient or the noise is high. Here, we experimentally demonstrate a remedy against loss and noise: strong noiseless amplification before detection. This way, we achieve loss-tolerant operation of an interferometer fed with squeezed and coherent light. With only 50% detection efficiency and with noise exceeding the level of squeezed light more than 50 times, we overcome the shot-noise limit by 6 dB. Sub-shot-noise phase sensitivity survives up to 87% loss. Application of this technique to other types of optical sensing and imaging promises a full use of quantum resources in these fields.
format	article
author	Gaetano Frascella Sascha Agne Farid Ya. Khalili Maria V. Chekhova
author_facet	Gaetano Frascella Sascha Agne Farid Ya. Khalili Maria V. Chekhova
author_sort	Gaetano Frascella
title	Overcoming detection loss and noise in squeezing-based optical sensing
title_short	Overcoming detection loss and noise in squeezing-based optical sensing
title_full	Overcoming detection loss and noise in squeezing-based optical sensing
title_fullStr	Overcoming detection loss and noise in squeezing-based optical sensing
title_full_unstemmed	Overcoming detection loss and noise in squeezing-based optical sensing
title_sort	overcoming detection loss and noise in squeezing-based optical sensing
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/aeb2c2b13b53470ab27c5ee728a9e9af
work_keys_str_mv	AT gaetanofrascella overcomingdetectionlossandnoiseinsqueezingbasedopticalsensing AT saschaagne overcomingdetectionlossandnoiseinsqueezingbasedopticalsensing AT faridyakhalili overcomingdetectionlossandnoiseinsqueezingbasedopticalsensing AT mariavchekhova overcomingdetectionlossandnoiseinsqueezingbasedopticalsensing
_version_	1718381279610667008

Overcoming detection loss and noise in squeezing-based optical sensing

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