Journal
PHYSICAL REVIEW LETTERS
Volume 116, Issue 9, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.116.090402
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Funding
- ERC
- EU-project Microkelvin
- INFN
- EU project NANOQUESTFIT
- John Templeton Foundation [39530]
- University of Trieste [FRA 2013]
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Collapse models predict a tiny violation of energy conservation, as a consequence of the spontaneous collapse of the wave function. This property allows us to set experimental bounds on their parameters. We consider an ultrasoft magnetically tipped nanocantilever cooled to millikelvin temperature. The thermal noise of the cantilever fundamental mode has been accurately estimated in the range 0.03-1 K, and any other excess noise is found to be negligible within the experimental uncertainty. From the measured data and the cantilever geometry, we estimate the upper bound on the continuous spontaneous localization collapse rate in a wide range of the correlation length r(C). Our upper bound improves significantly previous constraints for r(C) > 10(-6) m, and partially excludes the enhanced collapse rate suggested by Adler. We discuss future improvements.
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