Journal
NATURE PHOTONICS
Volume 7, Issue 8, Pages 613-619Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/NPHOTON.2013.177
Keywords
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Categories
Funding
- Australian Research Council
- International Science Linkages programme of the Commonwealth of Australia
- Council of Scientific and Industrial Research of India
- Istituto Nazionale di Fisica Nucleare of Italy
- Spanish Ministerio de Economia y Competitividad
- Conselleria d'Economia
- Hisenda i Innovacio of the Govern de les Illes Balears
- Royal Society
- Scottish Funding Council
- Scottish Universities Physics Alliance
- National Aeronautics and Space Administration
- National Research Foundation of Korea
- Ministry of Economic Development and Innovation,
- National Science and Engineering Research Council Canada
- Carnegie Trust
- Leverhulme Trust
- David and Lucile Packard Foundation
- Research Corporation
- Alfred P. Sloan Foundation
- Grants-in-Aid for Scientific Research [24103005] Funding Source: KAKEN
- Science and Technology Facilities Council [ST/L000911/1 Gravitational Waves, ST/I006269/1, ST/L000954/1, Gravitational Waves, PPA/G/S/2002/00652, ST/L000911/1, ST/L000938/1 Gravitational Waves, ST/I006242/1 Gravitational Waves, ST/J000361/1, ST/J000345/1, PP/F001118/1, ST/J00166X/1, ST/L000954/1 Gravitational Waves, ST/L000938/1, ST/I006285/1, ST/I006242/1, ST/J000345/1 Gravitational Waves, ST/K000845/1] Funding Source: researchfish
- STFC [ST/L000911/1, ST/I006285/1, ST/I006269/1, ST/J000361/1, ST/K000845/1, PP/F001118/1, ST/J000345/1, ST/L000938/1, ST/I006242/1, ST/L000954/1, Gravitational Waves, PPA/G/S/2002/00652, ST/J00166X/1] Funding Source: UKRI
- Direct For Mathematical & Physical Scien
- Division Of Physics [0967049, 0854790, 1205835, 1125565, 0955929, 1305863, 0905184, 1205882, 0970074, 1305864] Funding Source: National Science Foundation
- Division Of Physics
- Direct For Mathematical & Physical Scien [0855686, 1204371, 0969857, 1207010, 1307429, 1205512, 0855494, 1067985] Funding Source: National Science Foundation
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Nearly a century after Einstein first predicted the existence of gravitational waves, a global network of Earth-based gravitational wave observatories(1-4) is seeking to directly detect this faint radiation using precision laser interferometry. Photon shot noise, due to the quantum nature of light, imposes a fundamental limit on the attometre-level sensitivity of the kilometre-scale Michelson interferometers deployed for this task. Here, we inject squeezed states to improve the performance of one of the detectors of the Laser Interferometer Gravitational-Wave Observatory (LIGO) beyond the quantum noise limit, most notably in the frequency region down to 150 Hz, critically important for several astrophysical sources, with no deterioration of performance observed at any frequency. With the injection of squeezed states, this LIGO detector demonstrated the best broadband sensitivity to gravitational waves ever achieved, with important implications for observing the gravitational-wave Universe with unprecedented sensitivity.
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