Quadrature-witness readout for backscatter mitigation in gravitational-wave detectors limited by back-action
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arXiv
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| Hauptverfasser: | , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866917064274345984 |
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| author | Böttner, Niels Schnabel, Roman Korobko, Mikhail |
| author_facet | Böttner, Niels Schnabel, Roman Korobko, Mikhail |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2511_03842 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Quadrature-witness readout for backscatter mitigation in gravitational-wave detectors limited by back-action Böttner, Niels Schnabel, Roman Korobko, Mikhail Instrumentation and Detectors Instrumentation and Methods for Astrophysics General Relativity and Quantum Cosmology Quantum Physics 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. |
| title | Quadrature-witness readout for backscatter mitigation in gravitational-wave detectors limited by back-action |
| topic | Instrumentation and Detectors Instrumentation and Methods for Astrophysics General Relativity and Quantum Cosmology Quantum Physics |
| url | https://arxiv.org/abs/2511.03842 |