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  Control of a velocity-sensitive audio-band quantum non-demolition interferometer

Leavey, S. S., Danilishin, S. L., Gläfke, A., Barr, B. W., Bell, A. S., Gräf, C., et al. (in preparation). Control of a velocity-sensitive audio-band quantum non-demolition interferometer.

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1603.07756.pdf (Preprint), 2MB
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Leavey, S. S., Autor
Danilishin, S. L., Autor
Gläfke, A., Autor
Barr, B. W., Autor
Bell, A. S., Autor
Gräf, C., Autor
Hennig, J. -S., Autor
Houston, E. A., Autor
Huttner, S. H., Autor
Lück, H.1, Autor           
Pascucci, D., Autor
Somiya, K., Autor
Sorazu, B., Autor
Spencer, A., Autor
Steinlechner, S., Autor
Strain, K. A., Autor
Wright, J., Autor
Zhang, T., Autor
Hild, S., Autor
Affiliations:
1Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society, ou_24010              

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Schlagwörter: General Relativity and Quantum Cosmology, gr-qc, Astrophysics, Instrumentation and Methods for Astrophysics, astro-ph.IM,Quantum Physics, quant-ph
 Zusammenfassung: The Sagnac speed meter interferometer topology can potentially provide enhanced sensitivity to gravitational waves in the audio-band compared to equivalent Michelson interferometers. A challenge with the Sagnac speed meter interferometer arises from the intrinsic lack of sensitivity at low frequencies where the velocity-proportional signal is smaller than the noise associated with the sensing of the signal. Using as an example the on-going proof-of-concept Sagnac speed meter experiment in Glasgow, we quantify the problem and present a solution involving the extraction of a small displacement-proportional signal. This displacement signal can be combined with the existing velocity signal to enhance low frequency sensitivity, and we derive optimal filters to accomplish this for different signal strengths. We show that the extraction of the displacement signal for low frequency control purposes can be performed without reducing significantly the quantum non-demolition character of this type of interferometer.

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 Datum: 2016-03-24
 Publikationsstatus: Keine Angabe
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 Identifikatoren: arXiv: 1603.07756
URI: http://arxiv.org/abs/1603.07756
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