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=27μm, 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 57Hz and infer the residual damping at vanishing pressure γ/2π<9μHz. 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 10−13K. 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.

Testing dissipative collapse models with a levitated micromagnet / Vinante, A.; Gasbarri, G.; Timberlake, C.; Toroš, M.; Ulbricht, H.. - In: PHYSICAL REVIEW RESEARCH. - ISSN 2643-1564. - 2020, 2:4(2020). [10.1103/PhysRevResearch.2.043229]

Testing dissipative collapse models with a levitated micromagnet

Vinante, A.
Primo
;
2020-01-01

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=27μm, 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 57Hz and infer the residual damping at vanishing pressure γ/2π<9μHz. 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 10−13K. 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.
2020
4
Vinante, A.; Gasbarri, G.; Timberlake, C.; Toroš, M.; Ulbricht, H.
Testing dissipative collapse models with a levitated micromagnet / Vinante, A.; Gasbarri, G.; Timberlake, C.; Toroš, M.; Ulbricht, H.. - In: PHYSICAL REVIEW RESEARCH. - ISSN 2643-1564. - 2020, 2:4(2020). [10.1103/PhysRevResearch.2.043229]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11572/343842
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