Room temperature test of the continuous spontaneous localization model using a levitated micro-oscillator

Di Zheng, Yingchun Leng, Xi Kong, Rui Li, Zizhe Wang, Xiaohui Luo, Jie Zhao, Chang Kui Duan, Pu Huang, Jiangfeng Du, Matteo Carlesso, Angelo Bassi

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)
5 Downloads (Pure)


The continuous spontaneous localization (CSL) model predicts a tiny break of energy conservation via a weak stochastic force acting on physical systems, which triggers the collapse of the wave function. Mechanical oscillators are a natural way to test such a force; in particular, a levitated micromechanical oscillator has been recently proposed to be an ideal system. We report a proof-of-principle experiment with a micro-oscillator generated by a microsphere diamagnetically levitated in a magnetogravitational trap under high vacuum. Due to the ultralow mechanical dissipation, the oscillator provides a new upper bound on the CSL collapse rate, which gives an improvement of two orders of magnitude over the previous bounds in the same frequency range, and partially reaches the enhanced collapse rate suggested by Adler. Although being performed at room temperature, our experiment has already exhibited advantages over those operating at low temperatures. Our results experimentally show the potential for a magnetogravitational levitated mechanical oscillator as a promising method for testing the collapse model. Further improvements in cryogenic experiments are discussed.

Original languageEnglish
Article number013057
JournalPhysical Review Research
Issue number1
Publication statusPublished - 17 Jan 2020
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2020 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

ASJC Scopus subject areas

  • Physics and Astronomy(all)


Dive into the research topics of 'Room temperature test of the continuous spontaneous localization model using a levitated micro-oscillator'. Together they form a unique fingerprint.

Cite this