Hamburg 2016 – wissenschaftliches Programm
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GR: Fachverband Gravitation und Relativitätstheorie
GR 16: Gravitational Waves
GR 16.4: Vortrag
Freitag, 4. März 2016, 09:45–10:05, VMP6 HS A
Enhancing future gravitational wave detectors with two-mode-squeezed light — •Melanie Ast1,2, Sebastian Steinlechner2,3, and Roman Schnabel1,2 — 1Institut für Laserphysik und Zentrum für Optische Quantentechnologien der Universität Hamburg, Luruper Chaussee 149, D-22761 Hamburg, Germany — 2Institut für Gravitationsphysik der Leibniz Universität Hannover and Max-Planck-Institut für Gravitationsphysik (Albert-Einstein-Institut), Callinstraße 38, D-30167 Hannover, Germany — 3School of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, United Kingdom
Advanced gravitational-wave (GW) detectors employ kilometer scale Michelson-type interferometers to measure differential arm length changes in the order of 10−23/√Hz. The detectors are limited by quantum shot noise over a wide frequency range and squeezed light will most likely be used to push their sensitivity even further. The "classical" approach for lowering the quantum shot noise is to increase the circulating light power, which is accompanied by increased stray light. Inelastic back-scattering of stray light into the interferometer is a known problem and a potential limitation for the sensitivity of GW-detectors. In a table-top experiment we demonstrate the improvement of a scattered-light limited measurement below the quantum shot noise by employing two-mode-squeezed dual readout of an interferometer’s phase and amplitude quadrature.