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Quantum back-action cancellation in the audio band
Physical Review X ( IF 12.577 ) Pub Date : 
Jonathan Cripe; Torrey Cullen; Yanbei Chen; Paula Heu; David Follman; Garrett D. Cole; Thomas Corbitt

We report on the cancellation of quantum back action noise in an optomechanical cavity. We perform 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 transmitted by the optomechanical cavity allows us to cancel the back action noise between 2 kHz and 50 kHz as a consequence of the strong optical spring present in the detuned cavity. This cancellation yields a more sensitive measurement of the microresonator’s position with an 2 dB increase in sensitivity. To confirm that the back action is eliminated, we measure the noise in the transmission signal as a function of circulating power, and use a correlation technique between two photodetectors to remove shot noise. Remaining back action noise would be observable as a power-dependent noise floor, which is not observed. 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, VIRGO, and KAGRA.
更新日期:2020-08-01

 

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