# Broadband sensitivity enhancement of detuned dual-recycled Michelson interferometers with EPR entanglement

## TL;DR

This paper explores how EPR entanglement squeezing can improve the sensitivity of detuned dual-recycled Michelson interferometers, like GEO 600, considering practical imperfections such as losses and asymmetries.

## Contribution

It demonstrates the application of EPR entanglement squeezing to enhance interferometer sensitivity, accounting for real-world imperfections.

## Key findings

- EPR entanglement squeezing improves shot-noise-limited sensitivity.
- Losses and asymmetries impact the effectiveness of the scheme.
- The method is applicable to existing gravitational wave detectors like GEO 600.

## Abstract

We demonstrate the applicability of the EPR entanglement squeezing scheme for enhancing the shot-noise-limited sensitivity of a detuned dual-recycled Michelson interferometers. In particular, this scheme is applied to the GEO\,600 interferometer. The effect of losses throughout the interferometer, arm length asymmetries, and imperfect separation of the signal and idler beams are considered.