Abstract: Models of spontaneous wave function collapse describe the quantum-to-classical transition by assuming a progressive breakdown of the superposition principle when the mass of the system increases, providing a well-defined phenomenology in terms of a non-linearly and stochastically modified Schrödinger equation, which can be tested experimentally. The most popular of such models is the continuous spontaneous localization (CSL) model: in its original version, the collapse is driven by a white noise, and more recently, generalizations in terms of colored noises, which are more realistic, have been formulated. We will analyze how current non-interferometric tests bound the model, depending on the spectrum of the noise. We will find that low frequency purely mechanical experiments provide the most stable and strongest bounds. Graphical abstract: [Figure not available: see fulltext.].
Bibliographical noteFunding Information:
The authors wish to thank SL Adler for useful comments on a preliminary draft of the paper. MC and AB acknowledge financial support from the University of Trieste (FRA 2016), INFN, the COST Action QTSpace (CA15220) and the H2020 FET project TEQ (grant n. 766900). AB acknowledges hospitality from the IAS Princeton, where part of this work was carried out and partial financial support from FQXi. LF acknowledges funding from the Royal Society under the Newton International Fellowship No. NF170345.
© 2018, The Author(s).
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics