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GR: Fachverband Gravitation und Relativitätstheorie

GR 2: Gravitationswellen I

GR 2.10: Vortrag

Montag, 25. Februar 2013, 18:45–19:00, HS 6

Two-mode squeezed light for gravitational wave detectors — •Sebastian Steinlechner, Jöran Bauchrowitz, Melanie Meinders, Helge Müller-Ebhardt, Karsten Danzmann, and Roman Schnabel — Institut für Gravitationsphysik, Leibniz Universität Hannover and Max-Planck-Institut für Gravitationsphysik (Albert-Einstein-Institut), Callinstr. 38, 30167 Hannover, Germany

The high-frequency sensitivity of interferometric gravitational-wave detectors is limited by the light's quantum noise, i.e. shot-noise arising from zero-point fluctuations at the detection dark-port. Non-classical, squeezed-light readout can reduce this noise and has been successfully implemented in GEO600 and was recently also tested in LIGO. In the mid-frequency region, the quantum noise is obscured by both thermal noise and parasitic interferences due to scattered light. Here we present a novel quantum-dense interferometer readout scheme, which we implemented in a table-top experiment. This scheme is able to identify and possibly remove parasitic signals, thus increasing the detection sensitivity in frequency bands that were previously not quantum-noise limited.