First Long-Term Application of Squeezed States of Light in a Gravitational-Wave Observatory

Grote, H., Danzmann, K., Dooley, Katherine ORCID: https://orcid.org/0000-0002-1636-0233, Schnabel, R., Slutsky, J. and Vahlbruch, H. 2013. First Long-Term Application of Squeezed States of Light in a Gravitational-Wave Observatory. Physical Review Letters 110 (18) , 181101. 10.1103/PhysRevLett.110.181101

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Abstract

We report on the first long-term application of squeezed vacuum states of light to improve the shot-noise-limited sensitivity of a gravitational-wave observatory. In particular, squeezed vacuum was applied to the German-British detector GEO 600 during a period of three months from June to August 2011, when GEO 600 was performing an observational run together with the French-Italian Virgo detector. In a second period, the squeezing application continued for about 11 months from November 2011 to October 2012. During this time, squeezed vacuum was applied for 90.2% (205.2 days total) of the time that science-quality data were acquired with GEO 600. A sensitivity increase from squeezed vacuum application was observed broadband above 400 Hz. The time average of gain in sensitivity was 26% (2.0 dB), determined in the frequency band from 3.7 to 4.0 kHz. This corresponds to a factor of 2 increase in the observed volume of the Universe for sources in the kHz region (e.g., supernovae, magnetars). We introduce three new techniques to enable the long-term application of squeezed light, and show that the glitch rate of the detector did not increase from squeezing application. Squeezed vacuum states of light have arrived as a permanent application, capable of increasing the astrophysical reach of gravitational-wave detectors.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Schools > Physics and Astronomy
Subjects:	Q Science > QC Physics
Publisher:	American Physical Society
ISSN:	0031-9007
Last Modified:	23 Oct 2022 12:49
URI:	https://orca.cardiff.ac.uk/id/eprint/108798

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