Detuned Twin-Signal-Recycling for ultra-high precision interferometers

TL;DR

This paper introduces a novel interferometer design using detuned twin-signal-recycling with coupled resonators, significantly reducing noise and easing the use of squeezed light in gravitational wave detection.

Contribution

The proposed technique offers a new interferometer configuration that enhances sensitivity and simplifies the implementation of quantum noise reduction methods.

Findings

Reduces noise spectral density across a wide frequency band.

Eases the application of squeezed states of light.

Improves sensitivity for gravitational wave detection.

Abstract

We propose a new interferometer technique for high precision phase measurements such as those in gravitational wave detection. The technique utilizes a pair of optically coupled resonators that provides identical resonance conditions for the upper as well the lower phase modulation signal sidebands. This symmetry significantly reduces the noise spectral density in a wide frequency band compared with single sideband recycling topologies of current and planned gravitational wave detectors. Furthermore the application of squeezed states of light becomes less demanding.