Quantum squeezing schemes for heterodyne readout

T. Zhang, D. Martynov, A. Freise, H. Miao

Research output: Contribution to JournalArticleAcademicpeer-review


© 2020 American Physical SocietyAdvanced gravitational-wave detectors are limited by quantum noise in their most sensitive frequency band. Quantum noise suppression techniques, such as the application of the quantum squeezed state of light, have been actively studied in the context of homodyne readouts. In this paper, we consider quantum squeezing schemes for the heterodyne readouts. This is motivated by a successful suppression of the higher-order-mode content by stable recycling cavities in advanced detectors. The heterodyne readout scheme requires precise tuning of the interferometer parameters and a broadband squeezing source, but is conceptually simple and elegant. We further show that it is compatible with the frequency-dependent squeezing, which reduces both the shot noise and the radiation-pressure noise. We propose a test of the heterodyne readout with squeezing in Advanced LIGO. This can serve as a pathfinder not only for the implementation in future detectors, such as the Einstein Telescope and Cosmic Explorer, but also for general high-precision optical measurements.
Original languageEnglish
Article number124052
JournalPhysical Review D
Issue number12
Publication statusPublished - 15 Jun 2020
Externally publishedYes


We would like to thank Roman Schnabel, Ken Strain, Stefan Hild, Joseph Briggs, Lee McCuller, and Daniel Sigg for fruitful discussions. T. Z., D. M., A. F., and H. M. acknowledge the support of the Institute for Gravitational Wave Astronomy at University of Birmingham. A. F. has been supported by a Royal Society Wolfson Fellowship which is jointly funded by the Royal Society and the Wolfson Foundation. H. M. is supported by UK STFC Ernest Rutherford Fellowship (Grant No. ST/M005844/11).

FundersFunder number
Science and Technology Facilities CouncilST/M005844/11
Royal Society
Wolfson Foundation


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