Abstract
Modern gravitational-wave astronomy is based on the Michelson interferometer design, for which a key towards enhancement of the sensitivity is to reduce the noise which arises from different sources. As it was first proposed by Caves, injected squeezed states can be used to reduce the measurement shot noise, thus improving the sensitivity in the high-frequency band. This result was achieved with the German-British interferometer GEO600 in Hannover, and Advanced Virgo joined the third observational run on April 2019 with its operating source of squeezed vacuum producing an improvement in the high-frequency sensitivity up to 3 dB (the horizon for a Binary-Neutron Star detection increases by 2-4 Mpc).
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