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

Leavey, S. and Danilishin, S. L. and Gläfke, A. and Barr, B. W. and Gräf, C. and Hennig, J.-S. and Houston, E. A. and Lück, H. and Pascucci, D. and Somiya, K. and Spencer, A. and Steinlechner, S. and Strain, K. and Wright, J. and Zhang, T. and Hild, S. (2016) Control of a velocity-sensitive audio-band quantum non-demolition interferometer. [Data Collection] (Unpublished)

Original publication URL: http://arxiv.org/abs/1603.07756

Collection description

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.

College / School: College of Science and Engineering > School of Physics and Astronomy > Physics and Astronomy > Gravitational Research
Date Deposited: 23 Feb 2016 12:24
Retention date: 28 March 2026
Funder's Name: European Research Council (ERC), Science & Technologies Facilities Council (STFC), Science & Technologies Facilities Council (STFC)
URI: http://researchdata.gla.ac.uk/id/eprint/202

Available Files

Data

Read me

Repository Staff Only: Update this record

Leavey, S. and Danilishin, S. L. and Gläfke, A. and Barr, B. W. and Gräf, C. and Hennig, J.-S. and Houston, E. A. and Lück, H. and Pascucci, D. and Somiya, K. and Spencer, A. and Steinlechner, S. and Strain, K. and Wright, J. and Zhang, T. and Hild, S. (2016); Control of a velocity-sensitive audio-band quantum non-demolition interferometer

University of Glasgow

10.5525/gla.researchdata.202

Retrieved: 2017-11-18

Downloads

Downloads per month over past year