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Testing dissipative collapse models with a levitated micromagnet

Testing dissipative collapse models with a levitated micromagnet
Testing dissipative collapse models with a levitated micromagnet
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 radius R = 27 µm, is levitated by Meissner effect in a lead trap at 4.2 K and its motion is detected by a SQUID. We perform accurate ringdown measurements on the vertical translational mode with frequency 57 Hz, and infer the residual damping at vanishing pressure γ/2π < 9 µHz. From this upper limit we derive improved bounds on the dissipative versions of the CSL (continuous spontaneous localization) and the DP (Di´osi-Penrose) models. In particular, dissipative models give rise to an intrinsic damping of an isolated system with the effect parameterized 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 first bounds on dissipative effects in a more recent model, which relates the wave function collapse to fluctuations of a generalized complex-valued spacetime metric.
2643-1564
Vinante, Andrea
f023d600-0537-41c4-b307-bf9cdfc1f56c
Gasbarri, Giulio
1f6df418-5a22-4ec4-b24e-68aa10e0a684
Timberlake, Christopher
0620cbe2-aff4-444a-b420-b6a48a8b85dd
Toros, Marko
bd02c9f1-e498-474e-a98d-5b9882874915
Ulbricht, Hendrik
5060dd43-2dc1-47f8-9339-c1a26719527d
Vinante, Andrea
f023d600-0537-41c4-b307-bf9cdfc1f56c
Gasbarri, Giulio
1f6df418-5a22-4ec4-b24e-68aa10e0a684
Timberlake, Christopher
0620cbe2-aff4-444a-b420-b6a48a8b85dd
Toros, Marko
bd02c9f1-e498-474e-a98d-5b9882874915
Ulbricht, Hendrik
5060dd43-2dc1-47f8-9339-c1a26719527d

Vinante, Andrea, Gasbarri, Giulio, Timberlake, Christopher, Toros, Marko and Ulbricht, Hendrik (2020) Testing dissipative collapse models with a levitated micromagnet. Physical Review Research. (In Press)

Record type: Article

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 radius R = 27 µm, is levitated by Meissner effect in a lead trap at 4.2 K and its motion is detected by a SQUID. We perform accurate ringdown measurements on the vertical translational mode with frequency 57 Hz, and infer the residual damping at vanishing pressure γ/2π < 9 µHz. From this upper limit we derive improved bounds on the dissipative versions of the CSL (continuous spontaneous localization) and the DP (Di´osi-Penrose) models. In particular, dissipative models give rise to an intrinsic damping of an isolated system with the effect parameterized 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 first bounds on dissipative effects in a more recent model, which relates the wave function collapse to fluctuations of a generalized complex-valued spacetime metric.

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Accepted/In Press date: 8 October 2020

Identifiers

Local EPrints ID: 444467
URI: http://eprints.soton.ac.uk/id/eprint/444467
ISSN: 2643-1564
PURE UUID: d6b6ccfb-2a56-44de-98ec-c7a921cdca37
ORCID for Andrea Vinante: ORCID iD orcid.org/0000-0002-9385-2127

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Date deposited: 20 Oct 2020 16:32
Last modified: 29 Jan 2021 17:37

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Contributors

Author: Andrea Vinante ORCID iD
Author: Giulio Gasbarri
Author: Marko Toros

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