Quadrature-witness readout for backscatter mitigation in gravitational-wave detectors limited by back-action

• URL: http://arxiv.org/abs/2511.03842v1
• Date: Wed, 05 Nov 2025 20:21:13 GMT
• Title: Quadrature-witness readout for backscatter mitigation in gravitational-wave detectors limited by back-action
• Authors: Niels Böttner, Roman Schnabel, Mikhail Korobko,
• Abstract summary: Disturbances in gravitational wave (GW) observational data are often caused by non-stationary noise in the detector itself.<n>We present the concept of quadrature witness that is compatible with frequency-dependent squeezing.<n>We demonstrate that implementing this approach in a GW detector could reduce noise caused by loud back-scatter events.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Disturbances in gravitational wave (GW) observational data are often caused by non-stationary noise in the detector itself, such as back-scattering of laser stray light into the signal field. Unlike GW signals, non-stationary noise can appear in both the GW-signal quadrature and the orthogonal quadrature, which is usually not measured. Simultaneous sensing of this orthogonal quadrature provides a witness channel that can be used to reconstruct the disturbance in the signal quadrature enabling a subtraction of non-stationary noise. Here, we present the concept of quadrature witness that is compatible with frequency-dependent squeezing, which is already used to simultaneously reduce photon shot noise and photon radiation pressure noise. We demonstrate that implementing this approach in a GW detector could reduce noise caused by loud back-scatter events, thereby improving the overall sensitivity and robustness of GW observatories.

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