Quantum expander for gravitational-wave observatories

• 来源期刊: 光：科学与应用（英文版）
• 年，卷（期）: 2019,（6）
• 页码范围: 1152-1159
• 页数: 8页
• 语种: 英文

摘要

The quantum uncertainty of laser light limits the sensitivity of gravitational-wave observatories.Over the past 30 years,techniques for squeezing the quantum uncertainty,as well as for enhancing gravitational-wave signals with optical resonators have been invented.Resonators,however,have finite linewidths,and the high signal frequencies that are produced during the highly scientifically interesting ring-down of astrophysical compact-binary mergers still cannot be resolved.Here,we propose a purely optical approach for expanding the detection bandwidth.It uses quantum uncertainty squeezing inside one of the optical resonators,compensating for the finite resonators' linewidths while keeping the low-frequency sensitivity unchanged.This quantum expander is intended to enhance the sensitivity of future gravitational-wave detectors,and we suggest the use of this new tool in other cavity-enhanced metrological experiments.