@article{48366a0c2e5443449cd8f08503bd2166,
title = "Broadband quantum enhancement of the LIGO detectors with frequency-dependent squeezing",
abstract = "Quantum noise imposes a fundamental limitation on the sensitivity of interferometric gravitational-wave detectors like LIGO, manifesting as shot noise and quantum radiation pressure noise. Here, we present the first realization of frequency-dependent squeezing in full-scale gravitational-wave detectors, resulting in the reduction of both shot noise and quantum radiation pressure noise, with broadband detector enhancement from tens of hertz to several kilohertz. In the LIGO Hanford detector, squeezing reduced the detector noise amplitude by a factor of 1.6 (4.0 dB) near 1 kHz; in the Livingston detector, the noise reduction was a factor of 1.9 (5.8 dB). These improvements directly impact LIGO's scientific output for high-frequency sources (e.g., binary neutron star postmerger physics). The improved low-frequency sensitivity, which boosted the detector range by 15%-18% with respect to no squeezing, corresponds to an increase in the astrophysical detection rate of up to 65%. Frequency-dependent squeezing was enabled by the addition of a 300-meter-long filter cavity to each detector as part of the LIGO A+ upgrade.",
keywords = "UKRI, STFC, ST/S00246/1",
author = "{LIGO O4 Detector Collaboration} and D. Ganapathy and W. Jia and M. Nakano and V. Xu and N. Aritomi and T. Cullen and N. Kijbunchoo and Dwyer, {S. E.} and A. Mullavey and L. McCuller and R. Abbott and I. Abouelfettouh and Adhikari, {R. X.} and A. Ananyeva and S. Appert and K. Arai and Aston, {S. M.} and M. Ball and Ballmer, {S. W.} and D. Barker and L. Barsotti and Berger, {B. K.} and J. Betzwieser and D. Bhattacharjee and G. Billingsley and S. Biscans and N. Bode and E. Bonilla and V. Bossilkov and A. Branch and Brooks, {A. F.} and Brown, {D. D.} and J. Bryant and C. Cahillane and H. Cao and E. Capote and F. Clara and J. Collins and Compton, {C. M.} and R. Cottingham and Coyne, {D. C.} and R. Crouch and J. Csizmazia and Dartez, {L. P.} and N. Demos and E. Dohmen and Driggers, {J. C.} and A. Effler and A. Ejlli and R. Macas",
note = "Funding Information: The authors gratefully acknowledge the support of the United States National Science Foundation (NSF) for the construction and operation of the LIGO Laboratory and Advanced LIGO as well as the Science and Technology Facilities Council (STFC) of the United Kingdom, and the Max-Planck-Society (MPS) for support of the construction of Advanced LIGO. Additional support for Advanced LIGO was provided by the Australian Research Council. The authors acknowledge the LIGO Scientific Collaboration Fellows program for additional support. LIGO was constructed by the California Institute of Technology and Massachusetts Institute of Technology with funding from the National Science Foundation and operates under Cooperative Agreement No. PHY-18671764464. Advanced LIGO was built under Grant No. PHY-18680823459. The Upgrade to Advanced LIGO is supported by U.S. NSF Grant No. PHY-1834382 and United Kingdom STFC Grant No. ST/S00246/1, with additional support from the Australian Research Council. The authors thank Dennis Wilken, Vivishek Sudhir, James Lough, and Kim Burtnyk for carefully reading the manuscript. Publisher Copyright: {\textcopyright} 2023 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the {"}https://creativecommons.org/licenses/by/4.0/{"}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.",
year = "2023",
month = oct,
day = "30",
doi = "10.1103/PhysRevX.13.041021",
language = "English",
volume = "13",
journal = "Physical Review X",
issn = "2160-3308",
publisher = "American Physical Society",
number = "4",
}