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Quantum expander for gravitational-wave observatories

Korobko, Mikhail and Ma, Yiqiu and Chen, Yanbei and Schnabel, Roman (2019) Quantum expander for gravitational-wave observatories. Light: Science & Applications, 8 . Art. No. 118. ISSN 2047-7538. PMCID PMC6904558. doi:10.1038/s41377-019-0230-2.

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The quantum uncertainty of laser light limits the sensitivity of gravitational-wave observatories. Over the past 30 years, techniques for squeezing the quantum uncertainty, as well as for enhancing gravitational-wave signals with optical resonators have been invented. Resonators, however, have finite linewidths, and the high signal frequencies that are produced during the highly scientifically interesting ring-down of astrophysical compact-binary mergers still cannot be resolved. Here, we propose a purely optical approach for expanding the detection bandwidth. It uses quantum uncertainty squeezing inside one of the optical resonators, compensating for the finite resonators’ linewidths while keeping the low-frequency sensitivity unchanged. This quantum expander is intended to enhance the sensitivity of future gravitational-wave detectors, and we suggest the use of this new tool in other cavity-enhanced metrological experiments.

Item Type:Article
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URLURL TypeDescription CentralArticle Paper
Korobko, Mikhail0000-0002-3839-3909
Ma, Yiqiu0000-0001-7192-4874
Chen, Yanbei0000-0002-9730-9463
Schnabel, Roman0000-0003-2896-4218
Additional Information:© 2019 The Author(s). This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit Received 15 April 2019; Revised 13 November 2019; Accepted 28 November 2019. We thank Farid Khalili and Sebastian Steinlechner for valuable comments. M. K. was funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) – SCHN 757/6-1 and the European Research Council (ERC) Project “MassQ” (Grant No. 339897), and supported by the Deutsche Forschungsgemeinschaft under Germany’s Excellence Strategy – EXC 2121 “Quantum Universe” – 390833306”; Y. C. and Y. M. are supported by the National Science Foundation through Grants PHY-1708212 and PHY-1708213, the Brinson Foundation, and the Simons Foundation (Award Number 568762). Data availability: The code used to produce the figures is available by request to the corresponding author. Author Contributions: M.K.: conceptualization, formal analysis, methodology, software, visualization, writing; Y.M.: formal analysis, methodology, validation, software, writing (review and editing); Y.C.: supervision, validation, writing (review and editing); R.S.: project administration, supervision, writing (review and editing). The authors declare that they have no conflict of interest.
Group:TAPIR, Astronomy Department, LIGO
Funding AgencyGrant Number
Deutsche Forschungsgemeinschaft (DFG)SCHN 757/6-1
European Research Council (ERC)339897
Deutsche Forschungsgemeinschaft (DFG)EXC 2121
Deutsche Forschungsgemeinschaft (DFG)390833306
Brinson FoundationUNSPECIFIED
Simons Foundation568762
Subject Keywords:Nonlinear optics; Optical metrology; Quantum optics
PubMed Central ID:PMC6904558
Record Number:CaltechAUTHORS:20191216-104913614
Persistent URL:
Official Citation:Korobko, M., Ma, Y., Chen, Y. et al. Quantum expander for gravitational-wave observatories. Light Sci Appl 8, 118 (2019) doi:10.1038/s41377-019-0230-2
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:100298
Deposited By: Tony Diaz
Deposited On:16 Dec 2019 20:46
Last Modified:16 Feb 2022 23:05

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