Observation of a kilogram-scale oscillator near its quantum ground state
Author(s)Bayer, K.; Blackburn, Lindy L.; Bodiya, Timothy Paul; Brunet, G.; Cao, Junwei; Corbitt, Thomas R.; Donovan, Frederick J.; Duke, I.; Fritschel, Peter K.; Goda, K.; Grimaldi, F.; Harry, Gregory; Katsavounidis, Erotokritos; MacInnis, Myron E.; Markowitz, Jared John; Mason, Kenneth R.; Mavalvala, Nergis; Mittleman, R.; Ottaway, David J.; Ruet, L.; Sarin, P.; Shoemaker, David H.; Smith, N. D.; Stein, Leo Chaim; Weiss, Rainer; Wipf, Christopher C.; Zucker, Michael E.; LIGO Scientific Collaboration; ... Show more Show less
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We introduce a novel cooling technique capable of approaching the quantum ground state of a kilogram-scale system—an interferometric gravitational wave detector. The detectors of the Laser Interferometer Gravitational-wave Observatory (LIGO) operate within a factor of 10 of the standard quantum limit (SQL), providing a displacement sensitivity of 10[superscript −18] m in a 100 Hz band centered on 150 Hz. With a new feedback strategy, we dynamically shift the resonant frequency of a 2.7 kg pendulum mode to lie within this optimal band, where its effective temperature falls as low as 1.4 μK, and its occupation number reaches about 200 quanta. This work shows how the exquisite sensitivity necessary to detect gravitational waves can be made available to probe the validity of quantum mechanics on an enormous mass scale.
DepartmentMassachusetts Institute of Technology. Department of Physics; MIT Kavli Institute for Astrophysics and Space Research
New Journal of Physics
Institute of Physics Publishing
Abbott, B. et al. (LIGO Scientific Collaboration). "Observation of a kilogram-scale oscillator near its quantum ground state." New Journal of Physics 11 (2009).
Final published version