Frequency-Dependent Squeezing for Advanced LIGO
Abstract
The first detection of gravitational waves by the Laser Interferometer Gravitational-Wave Observatory (LIGO) in 2015 launched the era of gravitational-wave astronomy. The quest for gravitational-wave signals from objects that are fainter or farther away impels technological advances to realize ever more sensitive detectors. Since 2019, one advanced technique, the injection of squeezed states of light, is being used to improve the shot-noise limit to the sensitivity of the Advanced LIGO detectors, at frequencies above ∼50Hz. Below this frequency, quantum backaction, in the form of radiation pressure induced motion of the mirrors, degrades the sensitivity. To simultaneously reduce shot noise at high frequencies and quantum radiation pressure noise at low frequencies requires a quantum noise filter cavity with low optical losses to rotate the squeezed quadrature as a function of frequency. We report on the observation of frequency-dependent squeezed quadrature rotation with rotation frequency of 30 Hz, using a 16-m-long filter cavity. A novel control scheme is developed for this frequency-dependent squeezed vacuum source, and the results presented here demonstrate that a low-loss filter cavity can achieve the squeezed quadrature rotation necessary for the next planned upgrade to Advanced LIGO, known as "A+."
Additional Information
© 2020 Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Received 23 February 2020; accepted 23 March 2020; published 28 April 2020. LIGO was constructed by the California Institute of Technology and Massachusetts Institute of Technology with funding from the National Science Foundation, and operates under Cooperative Agreement No. PHY-1764464. Advanced LIGO was built under Grant No. PHY-0823459. The authors gratefully acknowledge the National Science Foundation Graduate Research Fellowship under Grant No. 1122374. Several people have contributed to the experiment over the years, in particular, John Miller, Georgia Mansell, Evan Hall, Naoki Aritomi, and Vivishek Sudhir. Measurements of the optical loss of the filter cavity optics have been made by Joshua Smith, Adrian Avila-Alvarez, and Juan A. Rocha at California State University, Fullerton. We also acknowledge fruitful discussions with members of the LIGO Scientific Collaboration, Virgo, and KAGRA Collaboration.Attached Files
Published - PhysRevLett.124.171102.pdf
Accepted Version - 2003.13443.pdf
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Additional details
- Eprint ID
- 102889
- Resolver ID
- CaltechAUTHORS:20200428-145030870
- PHY-1764464
- NSF
- PHY-0823459
- NSF
- DGE-1122374
- NSF Graduate Research Fellowship
- Created
-
2020-04-28Created from EPrint's datestamp field
- Updated
-
2022-10-26Created from EPrint's last_modified field
- Caltech groups
- LIGO