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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, wedoi:10.1038/s41377-019-0230-2 pmid:31839938 pmcid:PMC6904558 fatcat:wmvzz2wd6bczpcb36wxnqqwhaq