Squeezed-field injection for gravitational wave interferometers

TL;DR

This paper reports a successful demonstration of integrating squeezed field injection with advanced interferometer techniques, improving gravitational wave detection sensitivity by reducing shot noise, and analyzes optical losses affecting performance.

Contribution

It provides the first detailed analysis of optical losses in squeezed field injection for gravitational wave interferometers and estimates potential improvements in detector sensitivity.

Findings

Signal-to-noise ratio improved by up to 2.8 dB

Optical losses limit the nonclassical performance

Potential for enhanced GEO600 detector performance

Abstract

In a recent table-top experiment we demonstrated the compatibility of three advanced interferometer techniques for gravitational wave detection, namely power-recycling, detuned signal-recycling and squeezed field injection. The interferometer's signal to noise ratio was improved by up to 2.8 dB beyond the coherent state's shot-noise. This value was mainly limited by optical losses on the squeezed field. We present a detailed analysis of the optical losses of in our experiment and provide an estimation of the possible nonclassical performance of a future squeezed field enhanced GEO600 detector.