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

Lough, J., Schreiber, E., Bergamin, F., Grote, H., Mehmet, M., Vahlbruch, H., et al. (2021). First demonstration of 6 dB quantum noise reduction in a kilometer scale gravitational wave observatory. Physical Review Letters, 126: 041102. doi:10.1103/PhysRevLett.126.041102.

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 Creators:
Lough, James1, Author              
Schreiber, Emil1, Author              
Bergamin, Fabio1, Author              
Grote, Hartmut, Author
Mehmet, Moritz1, Author              
Vahlbruch, Henning1, Author              
Affeldt, Christoph1, Author              
Brinkmann, Marc1, Author              
Bisht, Aparna1, Author              
Kringel, Volker1, Author              
Lück, Harald1, Author              
Mukund, Nikhil1, Author              
Nadji, Severin Landry1, Author              
Sorazu, Borja, Author
Strain, Kenneth, Author
Weinert, Michael1, Author              
Danzmann, Karsten1, Author              
Affiliations:
1Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society, ou_24010              

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Free keywords: Physics, Instrumentation and Detectors, physics.ins-det
 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 $6.03 \pm 0.02$ 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 four. 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 towards the implementation of 10 dB of squeezing envisioned for third-generation gravitational wave detectors.

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 Dates: 2020-05-202021
 Publication Status: Published in print
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Title: Physical Review Letters
  Abbreviation : Phys. Rev. Lett.
Source Genre: Journal
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Publ. Info: Woodbury, N.Y. : American Physical Society
Pages: - Volume / Issue: 126 Sequence Number: 041102 Start / End Page: - Identifier: ISSN: 0031-9007
CoNE: https://pure.mpg.de/cone/journals/resource/954925433406_1