Quantum back action cancellation in the audio band

We report on the cancellation of quantum back action noise in an optomechanical cavity. We perform two measurements of the displacement of the microresonator, one in reflection of the cavity, and one in transmission of the cavity. We show that measuring the amplitude quadrature of the light in trans...

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Bibliographic Details
Published inarXiv.org
Main Authors Cripe, Jonathan, Cullen, Torrey, Chen, Yanbei, Heu, Paula, Follman, David, Cole, Garrett D, Corbitt, Thomas
Format Paper Journal Article
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 25.12.2018
Subjects
Gravitational waves
Noise
Noise measurement
Physics - Quantum Physics
Position measurement
Shot noise
Thermal noise
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Summary:We report on the cancellation of quantum back action noise in an optomechanical cavity. We perform two measurements of the displacement of the microresonator, one in reflection of the cavity, and one in transmission of the cavity. We show that measuring the amplitude quadrature of the light in transmission of the optomechanical cavity allows us to cancel the back action noise between 1 kHz and 50 kHz, and obtain a more sensitive measurement of the microresonator's position. To confirm that the back action is eliminated, we measure the noise in the transmission signal as a function of circulating power. By splitting the transmitted light onto two photodetectors and cross correlating the two signals, we remove the contributon from shot noise and measure a quantum noise free thermal noise spectrum. Eliminating the effects of back action in this frequency regime is an important demonstration of a technique that could be used to mitigate the effects of back action in interferometric gravitational wave detectors such as Advanced LIGO.
ISSN:2331-8422
DOI:10.48550/arxiv.1812.10028