# Broadband reduction of quantum radiation pressure noise via squeezed light injection

## TL;DR

This paper demonstrates the reduction of quantum radiation pressure noise in an optomechanical cavity at room temperature by injecting squeezed light, achieving a 1.2 dB noise floor reduction, relevant for gravitational wave detection.

## Contribution

It experimentally shows quantum radiation pressure noise reduction using squeezed light in a microresonator-based optomechanical system at room temperature.

## Key findings

- Achieved 1.2 dB reduction in measurement noise floor.
- Demonstrated QRPN reduction at frequencies relevant to gravitational wave detectors.
- Used squeezed light generated from a degenerate optical parametric oscillator.

## Abstract

We present the reduction and manipulation of quantum radiation pressure noise (QRPN) in an optomechanical cavity with the injection of squeezed light. The optomechanical system consists of a high-reflectivity single-crystal microresonator which serves as one mirror of a Fabry-Perot cavity. The experiment is performed at room temperature and is QRPN dominated between 10 kHz and 50 kHz, frequencies relevant to gravitational wave observatories. We observed a reduction of 1.2 dB in the measurement noise floor with the injection of amplitude squeezed light generated from a below-threshold degenerate optical parametric oscillator. This experiment is a crucial step in realizing the reduction of QRPN for future interferometric gravitational wave detectors and improving their sensitivity.