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Quantum Backaction Cancellation in the Audio Band

Cripe, Jonathan and Cullen, Torrey and Chen, Yanbei and Heu, Paula and Follman, David and Cole, Garrett D. and Corbitt, Thomas (2020) Quantum Backaction Cancellation in the Audio Band. Physical Review X, 10 (3). Art. No. 031065. ISSN 2160-3308. doi:10.1103/physrevx.10.031065.

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We report on the cancellation of quantum backaction 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 backaction noise between 2 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 a 2 dB increase in sensitivity. To confirm that the backaction 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 backaction noise would be observable as a power-dependent noise floor, which is not observed. Eliminating the effects of backaction in this frequency regime is an important demonstration of a technique that could be used to mitigate the effects of backaction in interferometric gravitational wave detectors such as Advanced LIGO, VIRGO, and KAGRA.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Cripe, Jonathan0000-0002-0977-8711
Chen, Yanbei0000-0002-9730-9463
Follman, David0000-0001-5893-5894
Cole, Garrett D.0000-0001-7149-3218
Corbitt, Thomas0000-0002-5520-8541
Alternate Title:Quantum back action cancellation in the audio band
Additional Information:© 2020 The Author(s). Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. (Received 27 August 2019; revised 11 June 2020; accepted 31 July 2020; published 23 September 2020) The microresonator manufacturing was carried out at the UCSB Nanofabrication Facility. This document has been assigned LIGO Document No. LIGO-P1800380. T. Corbitt, J. C., and T. Cullen acknowledge support by National Science Foundation Grants No. PHY-1150531 and No. PHY-1806634. Y. C. was funded by NSF Grants No. PHY-1708212 and No. PHY-1612816 and Simons Foundation Grant No. 568762. Y. C. conceptualized the theoretical background of the experiment. Y. C., T. Corbitt, and J. C. planned the experiment. J. C. led the investigation with help from T. Cullen and T. Corbitt, who also provided oversight. P. H., D. F., and G. D. C. fabricated the microresonators. J. C. led the writing of the original draft, and all authors assisted in the review and editing of the final draft. The authors declare no competing interests.
Group:TAPIR, Astronomy Department, LIGO
Funding AgencyGrant Number
Simons Foundation568762
Other Numbering System:
Other Numbering System NameOther Numbering System ID
LIGO DocumentP1800380
Issue or Number:3
Record Number:CaltechAUTHORS:20200925-135425878
Persistent URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:105569
Deposited By: George Porter
Deposited On:25 Sep 2020 22:49
Last Modified:16 Nov 2021 18:44

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