First demonstration of 6 dB quantum noise reduction in a kilometer scale gravitational wave observatory

Lough, James, Schreiber, Emil, Bergamin, Fabio, Grote, Hartmut ORCID: https://orcid.org/0000-0002-0797-3943, Mehmet, Moritz, Vahlbruch, Henning, Affeldt, Christoph, Brinkmann, Marc, Bisht, Aparna, Kringel, Volker, Lück, Harald, Mukund, Nikhil, Nadji, Severin, Sorazu, Borja, Strain, Kenneth, Weinert, Michael and Danzmann, Karsten 2021. First demonstration of 6 dB quantum noise reduction in a kilometer scale gravitational wave observatory. Physical Review Letters 126 (4) , 041102. 10.1103/PhysRevLett.126.041102

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Abstract

Photon shot noise, arising from the quantum-mechanical nature of the light, currently limits the sensitivity of all the gravitational wave observatories at frequencies above one kilohertz. We report a successful application of squeezed vacuum states of light at the GEO 600 observatory and demonstrate for the first time a reduction of quantum noise up to 6.03±0.02  dB in a kilometer scale interferometer. This is equivalent at high frequencies to increasing the laser power circulating in the interferometer by a factor of 4. Achieving this milestone, a key goal for the upgrades of the advanced detectors required a better understanding of the noise sources and losses and implementation of robust control schemes to mitigate their contributions. In particular, we address the optical losses from beam propagation, phase noise from the squeezing ellipse, and backscattered light from the squeezed light source. The expertise gained from this work carried out at GEO 600 provides insight toward the implementation of 10 dB of squeezing envisioned for third-generation gravitational wave detectors.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Publisher:	American Physical Society
ISSN:	0031-9007
Date of First Compliant Deposit:	28 January 2021
Date of Acceptance:	4 January 2021
Last Modified:	06 May 2023 00:25
URI:	https://orca.cardiff.ac.uk/id/eprint/138030

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