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Ganapathy, D.; Jia, W.; Cullen, T.; Kijbunchoo, N.; Dwyer, S. E.; Mullavey, A.; Abbott, R.; Abouelfettouh, I.; Adhikari, R. X.; Arai, K.; Aston, S. M.; Ball, M.; Barker, D.; Barsotti, L.; Berger, B. K.; Betzwieser, J.; Bhattacharjee, D.; Bonilla, E.; Bossilkov, V.; Branch, A.; Collins, J.; Compton, C. M.; Crouch, R.; Csizmazia, J.; Dartez, L. P.; Demos, N.; Ejlli, A.; Etzel, T.; Frischhertz, W.; Fritschel, P.; Frolov, V. V.; Giaime, J. A.; Giardina, K. D.; Glanzer, J.; Goetz, E.; Goetz, R.; Goodwin-Jones, A. W.; Gras, S.; Gray, C.; Grote, H.; Guidry, T.; Hall, E. D.; Heintze, M. C.; Helmling-Cornell, A. F.; Holland, N. A.; Hoyland, D.; James, A. L.; Karat, S.; Karki, S.; Kissel, J. S.; Kumar, R.; Lesovsky, M.; Loughlin, H. A.; Makarem, C. N.; Mannix, B.; Martin, R. M.; Mason, K.; Mavalvala, N.; McCarrol, G.; McClelland, D. E.; McCormick, S.; McRae, T.; Mera, F.; Mittleman, R.; Moreno, G.; Oberling, J.; Osthelder, C.; Ottaway, D. J.; Pele, A.; Pirello, M.; Ramirez, K. E.; Reyes, J.; Richardson, J. W.; Robinson, M.; Rollins, J. G.; Romie, J. H.; Ross, M. P.; Sanchez, A.; Sanchez, L. E.; Schaetzl, D.; Schofield, R. M. S.; Schwartz, E.; Shaffer, T.; Soike, C.; Srivastava, V.; Sun, L.; Tanner, D. B.; Thorne, K. A.; Torrie, C. I.; Ubhi, A. S.; Vajente, G.; Vanosky, J.; Vecchio, A.; von Reis, E. R. G.; Warner, J.; Weaver, B.; Weiss, R.; Willke, B.; Yamamoto, H.; Zucker, M. E.
Physical review. X, 10/2023, Volume: 13, Issue: 4Journal Article
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.
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