Vinante, A;
Gasbarri, G;
Timberlake, C;
Toroš, M;
Ulbricht, H;
(2020)
Testing Dissipative Collapse Models with a Levitated Micromagnet.
Physical Review Research
, 2
, Article 043229. 10.1103/PhysRevResearch.2.043229.
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Abstract
We present experimental tests of dissipative extensions of spontaneous wave function collapse models based on a levitated micromagnet with ultralow dissipation. The spherical micromagnet, with a radius R = 27 μm, is levitated by the Meissner effect in a lead trap at 4.2K and its motion is detected by a superconducting quantum interference device. We perform accurate ringdown measurements on the vertical translational mode with frequency 57 Hz and infer the residual damping at vanishing pressure gamma/2π < 9μ Hz. From this upper limit we derive improved bounds on the dissipative versions of the continuous spontaneous localization (CSL) and the Diósi-Penrose (DP) models with proper choices of the reference mass. In particular, dissipative models give rise to an intrinsic damping of an isolated system with the effect parametrized by a temperature constant; the dissipative CSL model with temperatures below 1 nK is ruled out, while the dissipative DP model is excluded for temperatures below 10^{-13} K. Furthermore, we present the bounds on dissipative effects in a more recent model, which relates the wave function collapse to fluctuations of a generalized complex-valued space-time metric.
| Type: | Article |
|---|---|
| Title: | Testing Dissipative Collapse Models with a Levitated Micromagnet |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1103/PhysRevResearch.2.043229 |
| Publisher version: | http://dx.doi.org/10.1103/PhysRevResearch.2.043229 |
| Language: | English |
| Additional information: | © 2021 American Physical Society. Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license (https://creativecommons.org/licenses/by/4.0/). |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10115935 |
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