Bremen 2017 – wissenschaftliches Programm
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GR: Fachverband Gravitation und Relativitätstheorie
GR 11: Gravitationswellen
GR 11.1: Vortrag
Mittwoch, 15. März 2017, 17:30–17:50, SFG 0140
Beating the standard sensitivity-bandwidth limit of cavity-enhanced interferometers with internal squeezed light generation — •Mikhail Korobko1, Lisa Kleybolte1, Stefan Ast2, Haixing Miao3, Yanbei Chen4, and Roman Schnabel1 — 1Institut für Laserphysik und Zentrum für Optische Quantentechnologien, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany — 2Institut für Gravitationsphysik, Leibniz Universität Hannover and Max-Planck-Institut für Gravitationsphysik (Albert-Einstein-Institut), Callinstraße 38, 30167 Hannover, Germany — 3Institute of Gravitational Wave Astronomy, University of Birmingham, Birmingham B15 2TT, United Kingdom — 4Caltech CaRT, Pasadena, California 91125, USA
The shot-noise limited sensitivity of cavity-enhanced interferometric measurement devices, such as gravitational-wave detectors, can be improved by increasing the cavity finesse, given the fixed light power inside the detector. This comes at a price of proportional reduction of the detection bandwidth. It is possible to overcome this standard sensitivity-bandwidth limit using non-classical correlations in the light field. Here, we investigate the internal squeezing approach, where the parametric amplification process creates a non-classical correlation directly inside the interferometer cavity. We analyse the limits of the approach theoretically, and measure 36% increase in the sensitivity-bandwidth product compared to the classical case. To our knowledge this is the first experimental demonstration of improving the sensitivity-bandwidth product using internal squeezing.