Speaker
Description
Squeezed light in an integral part of LIGO, Virgo and future ground-based observatories and is essential to optimize their sensitivity and range. High quantum enhancement is currently limited by interferometer, injection and detection losses. While interferometer losses are fundamental, detection losses can be mitigated by parametric amplification.
We propose a new approach to produce squeezing and amplification in a single device directly at the interferometer output, thus simultaneously avoiding injection losses by discarding the injection optics. In an experiment we demonstrate how this increases the signal to noise ratio without increasing the overall noise floor.
This enables a sensitivity improvement especially with significant or restraining detection inefficiencies which might originate in output optics, photodetection, or mode overlap for balanced detectors.