Demonstration of a squeezed-light-enhanced power- and signal-recycled Michelson interferometer.
We report on the experimental combination of three advanced interferometer techniques for gravitational wave detection, namely, power recycling, detuned signal recycling, and squeezed field injection. For the first time, we experimentally prove the compatibility of especially the latter two. To achieve a broadband nonclassical sensitivity improvement, we applied a filter cavity for compensation of quadrature rotation. The signal-to-noise ratio was improved by up to 2.8 dB beyond the coherent state's shot noise. The complete setup was stably locked for arbitrary times and characterized by injected single-sideband modulation fields.
Vahlbruch
Henning
H
Institut für Atom- und Molekülphysik, Universität Hannover and Max-Planck-Institut für Gravitationsphysik (Albert-Einstein-Institut), Callinstrasse 38, 30167 Hannover, Germany.
Chelkowski
Simon
S
Hage
Boris
B
Franzen
Alexander
A
Danzmann
Karsten
K
Schnabel
Roman
R