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Narrowing the parameter space of collapse models with ultracold layered force sensors

Narrowing the parameter space of collapse models with ultracold layered force sensors
Narrowing the parameter space of collapse models with ultracold layered force sensors
Despite the unquestionable empirical success of quantum theory, witnessed by the recent uprising of quantum technologies, the debate on how to reconcile the theory with the macroscopic classical world is still open. Spontaneous collapse models are one of the few testable solutions so far proposed. In particular, the continuous spontaneous localization (CSL) model has become subject of intense experimental research. Experiments looking for the universal force noise predicted by CSL in ultrasensitive mechanical resonators have recently set the strongest unambiguous bounds on CSL. Further improving these experiments by direct reduction of mechanical noise is technically challenging. Here, we implement a recently proposed alternative strategy that aims at enhancing the CSL noise by exploiting a multilayer test mass attached on a high quality factor microcantilever. The test mass is specifically designed to enhance the effect of CSL noise at the characteristic length r10−7 m. The measurements are in good agreement with pure thermal motion for temperatures down to 100 mK. From the absence of excess noise, we infer a new bound on the collapse rate at the characteristic length r= 10−7 m, which improves over previous mechanical experiments by more than 1 order of magnitude. Our results explicitly challenge a well-motivated region of the CSL parameter space proposed by Adler.
1079-7114
Vinante, A.
f023d600-0537-41c4-b307-bf9cdfc1f56c
Carlesso, M.
bdaf218c-85ae-43fb-a347-47800841078e
Bassi, A.
607b3bae-7360-4251-8546-5b199218377b
Chiasera, A.
af3cfd5a-6571-4cd4-b594-91b4d82f0cf1
Varas, S.
e246cdbe-02bc-4da5-a026-12a8739974cb
Falferi, P.
157151f2-e576-47ed-a389-666076b5b280
Margesin, B.
99f08923-9c56-4ce6-bba8-39f62b2490a5
Mezzena, R.
4579c54b-9f65-4d29-9364-f343eb574479
Ulbricht, H.
5060dd43-2dc1-47f8-9339-c1a26719527d
Vinante, A.
f023d600-0537-41c4-b307-bf9cdfc1f56c
Carlesso, M.
bdaf218c-85ae-43fb-a347-47800841078e
Bassi, A.
607b3bae-7360-4251-8546-5b199218377b
Chiasera, A.
af3cfd5a-6571-4cd4-b594-91b4d82f0cf1
Varas, S.
e246cdbe-02bc-4da5-a026-12a8739974cb
Falferi, P.
157151f2-e576-47ed-a389-666076b5b280
Margesin, B.
99f08923-9c56-4ce6-bba8-39f62b2490a5
Mezzena, R.
4579c54b-9f65-4d29-9364-f343eb574479
Ulbricht, H.
5060dd43-2dc1-47f8-9339-c1a26719527d

Vinante, A., Carlesso, M., Bassi, A., Chiasera, A., Varas, S., Falferi, P., Margesin, B., Mezzena, R. and Ulbricht, H. (2020) Narrowing the parameter space of collapse models with ultracold layered force sensors. Physical Review Letters, 125 (100404), [100404]. (doi:10.1103/PhysRevLett.125.100404).

Record type: Article

Abstract

Despite the unquestionable empirical success of quantum theory, witnessed by the recent uprising of quantum technologies, the debate on how to reconcile the theory with the macroscopic classical world is still open. Spontaneous collapse models are one of the few testable solutions so far proposed. In particular, the continuous spontaneous localization (CSL) model has become subject of intense experimental research. Experiments looking for the universal force noise predicted by CSL in ultrasensitive mechanical resonators have recently set the strongest unambiguous bounds on CSL. Further improving these experiments by direct reduction of mechanical noise is technically challenging. Here, we implement a recently proposed alternative strategy that aims at enhancing the CSL noise by exploiting a multilayer test mass attached on a high quality factor microcantilever. The test mass is specifically designed to enhance the effect of CSL noise at the characteristic length r10−7 m. The measurements are in good agreement with pure thermal motion for temperatures down to 100 mK. From the absence of excess noise, we infer a new bound on the collapse rate at the characteristic length r= 10−7 m, which improves over previous mechanical experiments by more than 1 order of magnitude. Our results explicitly challenge a well-motivated region of the CSL parameter space proposed by Adler.

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Challenging spontaneous collapse models with ultracold layered force sensors - Accepted Manuscript
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More information

Accepted/In Press date: 24 July 2020
e-pub ahead of print date: 3 September 2020
Published date: 4 September 2020

Identifiers

Local EPrints ID: 442912
URI: http://eprints.soton.ac.uk/id/eprint/442912
ISSN: 1079-7114
PURE UUID: ab571b09-4932-46a4-aa3a-b852bba276cc
ORCID for A. Vinante: ORCID iD orcid.org/0000-0002-9385-2127

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Date deposited: 31 Jul 2020 16:30
Last modified: 26 Nov 2021 06:16

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Contributors

Author: A. Vinante ORCID iD
Author: M. Carlesso
Author: A. Bassi
Author: A. Chiasera
Author: S. Varas
Author: P. Falferi
Author: B. Margesin
Author: R. Mezzena
Author: H. Ulbricht

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