Increasing future gravitational-wave detectors sensitivity by means of amplitude filter cavities and quantum entanglement

TL;DR

This paper proposes an improved scheme for future gravitational-wave detectors that enhances sensitivity by using amplitude filter cavities and quantum entanglement to reduce quantum noise.

Contribution

The paper introduces a novel approach combining amplitude filter cavities with quantum entanglement to further decrease quantum noise in gravitational-wave detection.

Findings

Enhanced quantum noise reduction compared to previous schemes

Potential for significant sensitivity improvements in future detectors

Utilization of quantum entanglement between optical fields

Abstract

The future laser interferometric gravitational-wave detectors sensitivity can be improved using squeezed light. In particular, recently a scheme which uses the optical field with frequency dependent squeeze factor, prepared by means of a relatively short (~30 m) amplitude filter cavity, was proposed \cite{Corbitt2004-3}. Here we consider an improved version of this scheme, which allows to further reduce the quantum noise by exploiting the quantum entanglement between the optical fields at the filter cavity two ports.