Gravity induced wave function collapse

Gasbarri, Giulio; Toroš, Marko; Donadi, Sandro; Bassi, Angelo

doi:10.1103/physrevd.96.104013

Cited by 38 publications

(53 citation statements)

References 42 publications

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“…It is not difficult to show that the new terms stochastically drive the state vector toward one of the eigenstates of the operatorÂ, with a probability equal to the Born rule [104,113]. The above equation can be generalized to include more than one operator, therefore more than one noise [104]; non-self-adjoint operators [104]; more general noises, either complex [114], non white [115,116,117], or both [118]. So far, we presented the abstract formulation of collapse models.…”

Section: Spontaneous Wave Function Collapse and The Role Of Gravitymentioning

confidence: 99%

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Gravitational decoherence

Bassi¹,

Großardt²,

Ulbricht³

2017

Class. Quantum Grav.

198

192

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Abstract. We discuss effects of loss of coherence in low energy quantum systems caused by or related to gravitation, referred to as gravitational decoherence. These effects, resulting from random metric fluctuations, for instance, promise to be accessible by relatively inexpensive table-top experiments, way before the scales where true quantum gravity effects become important. Therefore, they can provide a first experimental view on gravity in the quantum regime. We will survey models of decoherence induced both by classical and quantum gravitational fluctuations; it will be manifest that a clear understanding of gravitational decoherence is still lacking. Next we will review models where quantum theory is modified, under the assumption that gravity causes the collapse of the wave functions, when systems are large enough. These models challenge the quantum-gravity interplay, and can be tested experimentally. In the last part we have a look at the state of the art of experimental research. We will review efforts aiming at more and more accurate measurements of gravity (G and g) and ideas for measuring conventional and unconventional gravity effects on nonrelativistic quantum systems.

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Section: Spontaneous Wave Function Collapse and The Role Of Gravitymentioning

confidence: 99%

“…To this purpose, let us consider the center-of-mass equation of a composite system. Under suitable approximations, which are typically valid for crystalline structures forming macroscopic objects, the center of mass and relative motions decouple and the Lindblad term for the center-of-mass density-matrixρ M t takes the form [118]:…”

Section: Adler's Proposalmentioning

confidence: 99%

Gravitational decoherence

Bassi¹,

Großardt²,

Ulbricht³

2017

Class. Quantum Grav.

198

192

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“…This reveals the importance of careful characterization of environmental sources of decoherence in view of probing new physics, which is the aim of the space experiments with large nanoparticles reviewed here. It should be noted indeed that, the experimental setups considered here are relevant also for testing other models predicting non-standard decoherence mechanisms [45][46][47] or models like the Diósi-Penrose (DP) one [48][49][50] in which the wave function collapse is related to gravity.…”

Section: Superposition Of Macroscopic Systems: the Case For Spacementioning

confidence: 99%

Testing the foundation of quantum physics in space via Interferometric and non-interferometric experiments with mesoscopic nanoparticles

et al. 2021

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Quantum technologies are opening novel avenues for applied and fundamental science at an impressive pace. In this perspective article, we focus on the promises coming from the combination of quantum technologies and space science to test the very foundations of quantum physics and, possibly, new physics. In particular, we survey the field of mesoscopic superpositions of nanoparticles and the potential of interferometric and non-interferometric experiments in space for the investigation of the superposition principle of quantum mechanics and the quantum-to-classical transition. We delve into the possibilities offered by the state-of-the-art of nanoparticle physics projected in the space environment and discuss the numerous challenges, and the corresponding potential advancements, that the space environment presents. In doing this, we also offer an ab-initio estimate of the potential of space-based interferometry with some of the largest systems ever considered and show that there is room for tests of quantum mechanics at an unprecedented level of detail.

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“…Some attempts have been undertaken and can also been seen as a stochastic modification of the Schrödinger-Newton equation, which was discussed in Sect. 3.1 [34,[82][83][84]. Tests of such gravity collapse models follow the same logic as tests of collapse models and in general a set of parameters has to be fulfilled.…”

Section: Gravitational Decoherence Effectsmentioning

confidence: 99%

“…In such a case, the stronger upper bound on the left part of the plane is given by data analysis with cold atom experiments (Cold atoms) [35]. Picture and caption has been taken from [84] experimental test we refer to [84], where the Fig. 7) has been taken from.…”

Section: Gravitational Decoherence Effectsmentioning

confidence: 99%

Testing Fundamental Physics by Using Levitated Mechanical Systems

Ulbricht

2021

Molecular Beams in Physics and Chemistry

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We will describe recent progress of experiments towards realising large-mass single particle experiments to test fundamental physics theories such as quantum mechanics and gravity, but also specific candidates of Dark Matter and Dark Energy. We will highlight the connection to the work started by Otto Stern as levitated mechanics experiments are about controlling the centre of mass motion of massive particles and using the same to investigate physical effects. This chapter originated from the foundations of physics session of the Otto Stern Fest at Frankfurt am Main in 2019, so we will also share a view on the Stern Gerlach experiment and how it related to tests of the principle of quantum superposition.

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Gravity induced wave function collapse

Cited by 38 publications

References 42 publications

Gravitational decoherence

Gravitational decoherence

Testing the foundation of quantum physics in space via Interferometric and non-interferometric experiments with mesoscopic nanoparticles

Testing Fundamental Physics by Using Levitated Mechanical Systems

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