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17/06/2024 09:30
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Serge Reynaud (LKB)17/06/2024 09:35
Basics on Quantum Noise and Squeezing
Serge Reynaud
Directeur de recherche émérite au CNRS
Laboratoire Kastler Brossel (Paris)
(Sorbonne Université, ENS-PSL, Collège de France, CNRS)Quantum noise arises from the basic principles of quantum theory. It is a limitation in all high-sensitivity measurements, when other sources of noise are mastered.
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When the quantum noise level is... -
Eleonora Capocasa, Angélique Lartaux (IJCLab)17/06/2024 10:35
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Franck Pereira Dos Santos (SYRTE)17/06/2024 12:00
Je montrerai comment l'utilisation d'états atomiques non classiques permet d'améliorer la sensibilité de capteurs quantiques basés sur des méthodes d'interférométrie atomique au delà de la limite quantique, liée à la détection des populations dans les ports de sortie des interféromètres, et je dresserai un panorama des activités dans le domaine, qui a récemment connu un regain d'intérêt.
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Anne Daumas (Laboratoire Astroparticules et Cosmologie (APC))17/06/2024 14:00
During the commissioning for the O4 observation run, the currently implemented marginally stable recycling cavities in Virgo have created difficulties with locking and alignment, as well as degrading the performances of the interferometer. Thus, for the next observation run, Virgo is planning to implement stable recycling cavities, and will pause the implementation of larger test masses for...
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Clement JACQUET (CNRS - L2IT)17/06/2024 14:20
Optical characterization is crucial to models correctly the behavior of the interferometer and to optimise its working condition. In order to estimate some optical parameters of the Virgo arm Fabry-Perot cavities (such as g-factor, radius of curvature (RoC) of the test masses, finesse, mismatching with respect to the input beam) a free spectral range (FSR) measurement campaign is currently...
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M. Yuhang Zhao (APC, Université Paris Cité)17/06/2024 14:40
Optical losses introduce noise, impair noise reduction techniques, and degrade signal gain in gravitational wave detectors. The squeezed vacuum state of light is a well-established method for quantum noise reduction. An optical cavity, often called a filter cavity, is essential to impose a frequency-dependent phase rotation on the squeezed vacuum. In the Virgo gravitational wave detector, the...
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Paul STEVENS (CNRS / IJCLab)17/06/2024 15:00
The implementation of Fabry-Perot cavities in gravitational-wave detectors has been pivotal to improving their sensitivity, allowing the observation of an increasing number of cosmological events with higher signal-to-noise ratio. Notably, Fabry-Perot cavities play a key role in the frequency-dependent squeezing technique, which provides a reduction of quantum noise over the whole observation...
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Stéphanie Grabielle (Laboratoire ARTEMIS)17/06/2024 15:40
Le phénomène d’instabilités paramétriques constitue une des limitations à l’augmentation de la puissance intra-cavité sur chaque bras de l’interféromètre du détecteur VIRGO. Pour implémenter une solution active d’atténuation de ce phénomène, il est nécessaire d’être capable de monitorer son évolution en temps réel, par exemple, en caractérisant l’évolution des modes mécaniques résonnants...
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Mael Brun17/06/2024 16:00
Among the noises affecting gravitational wave detectors, Newtonian Noise results from variations in the gravity field induced by fluctuations of the mass distribution in the vicinity of sensitive optical elements, in particular test masses. This paper focuses on the modeling of Newtonian Noise of acoustic origin, i.e. resulting from the presence of an infrasound acoustic field in experimental...
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Leon Vidal17/06/2024 16:20
The sensitivity of today’s gravitational wave detectors is limited by a multitude of noise sources, defining an exploitable frequency band around 10 Hz to 10 kHz. Although these instruments are isolated by several orders of magnitude from the Earth’s seismic activity thanks to advanced isolation systems, seismic noise prevents any detection below a few Hz. During the Apollo missions,...
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Maxime VINCENT (AstroParticule et Cosmologie)17/06/2024 16:40
La contribution française au Consortium LISA, spécifiquement sur l'aspect instrumental, se concentre sur le développement des moyens de tests au sol pour LISA. Plus précisément, l'une des tâches de la communauté française est de tester et de valider les performances du système de détection interférométrique (IDS), composé de modèles représentatifs vol du banc optique LISA (UKATC), du système...
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