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
Highlights
Since the birth of quantum mechanics with its striking differences compared to our classical intuition, the quantum-to-classical transition has puzzled the scientific community
The paper is organized as follows: in Section 2 we introduce the colored CSL” (cCSL) model and we compute its contribution to the density noise spectrum (DNS) of optomechanical systems
Before digging into the details of the cCSL model, we start by reviewing the basic features of continuous spontaneous localization (CSL) model, which will be useful for the following analysis
Summary
Since the birth of quantum mechanics with its striking differences compared to our classical intuition, the quantum-to-classical transition has puzzled the scientific community. Note that in non-interferometric experiments one can consider systems which are (truly) macroscopic In such a case, due to the amplification mechanism, the collapse can be more significant and easier to detect. If one thinks that the noise providing the collapse has a physical origin, it cannot be white but colored, with a cut off This extension of the CSL model has already been formulated [15,35,36,37,38,39,40], and we will refer to it as “colored CSL” (cCSL): this is the subject of the present article. We will investigate the bounds that non-interferometric experiments place on the collapse parameters λ and rC, when a colored noise with exponentially decaying correlation function is considered.
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