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

Lough, James; Schreiber, Emil; Bergamin, Fabio; Grote, Hartmut; Mehmet, Moritz; Vahlbruch, Henning; Affeldt, Christoph; Brinkmann, Marc; Bisht, Aparna; Kringel, Volker; Lück, Harald; Mukund, Nikhil; Nadji, Severin Landry; Sorazu, Borja; Strain, Kenneth; Weinert, Michael; Danzmann, Karsten

doi:10.1103/PhysRevLett.126.041102

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

MPS-Authors

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Lough, James
Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

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Schreiber, Emil
Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

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Bergamin, Fabio
Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

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Mehmet, Moritz
Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

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Vahlbruch, Henning
Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

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Affeldt, Christoph
Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

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Brinkmann, Marc
Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

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Bisht, Aparna
Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

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Kringel, Volker
Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

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Lück, Harald
Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

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Mukund, Nikhil
Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

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Nadji, Severin Landry
Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

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Weinert, Michael
Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

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Danzmann, Karsten
Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

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2005.10292.pdf
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PhysRevLett.126.041102.pdf
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Citation

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.

Cite as: https://hdl.handle.net/21.11116/0000-0006-A00A-A

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.