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Nature Photonics publication

New Nature Photonics publication shows path forward for more sensitive gravitational-wave detectors

Together with lead author Min Jet Yan, collaborators from the Department of Quantum Science in the Research School of Physics and Engineering at Australian National University, and Thomas Corbitt’s research group from Louisiana State University, CMS is excited to have worked on research that is now published in Nature Photonics titled, “Broadband reduction of quantum radiation pressure noise via squeezed light injection.” In the paper, crystalline coatings enable observation of a reduction in the quantum back-action noise of 1.2 dB. These results show a path for greatly improving the sensitivity of future interferometric gravitational-wave detectors through the use of quantum radiation pressure noise (QRPN). Please join CMS in congratulating all the authors and celebrating the publishing of this work.


Full reference:

Min Jet Yap, Jonathan Cripe, Georgia L. Mansell, Terry G. McRae, Robert L. Ward, Bram J. J. Slagmolen, Paula Heu, David Follman, Garrett D. Cole, Thomas Corbitt & David E. McClelland, “Broadband reduction of quantum radiation pressure noise via squeezed light injection,” Nature Photonics, online October 7, 2019.



The Heisenberg uncertainty principle states that the position of an object cannot be known with infinite precision, as the momentum of the object would then be totally uncertain. This momentum uncertainty then leads to position uncertainty in future measurements. When continuously measuring the position of an object, this quantum effect, known as back-action, limits the achievable precision. In audio-band, interferometer-type gravitational-wave detectors, this back-action effect manifests as quantum radiation pressure noise (QRPN) and will ultimately (but does not yet) limit sensitivity. Here, we present the use of a quantum engineered state of light to directly manipulate this quantum back-action in a system where it dominates the sensitivity in the 10–50 kHz range. We observe a reduction of 1.2 dB in the quantum back-action noise. This experiment is a crucial step in realizing QRPN reduction for future interferometric gravitational-wave detectors and improving their sensitivity.