Computer Science
Scientific paper
Apr 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991sci...252..528y&link_type=abstract
Science (ISSN 0036-8075), vol. 252, April 26, 1991, p. 528-532.
Computer Science
2
Gravitational Waves, Impedance Matching, Quantum Mechanics, Radiation Detectors, Supernovae, Noise Reduction, Signal To Noise Ratios
Scientific paper
Back-action evasion is a measurement technique originally devised to overcome certain limits imposed by quantum mechanics on the sensitivity of gravitational radiation detectors. The technique is, however, more generally applicable and can be used to improve the sensitivity of instrumentation with noise floors much greater than the quantum noise floor. The principle of back-action evasion is described here by means of a simple example. A comparison of back-action evasion with impedance matching is made to clarify when back-action evasion may be useful. Back-action evasion allows one to achieve a sensitivity comparable to that achieved by impedance matching.
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