Experimental bounds on collapse models from gravitational wave detectors

Carlesso, Matteo; Bassi, Angelo; Falferi, P.; Vinante, Andrea

doi:10.1103/physrevd.94.124036

Cited by 125 publications

(182 citation statements)

References 43 publications

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“…Moreover, a temperature resolution better than 0.1 K has already been demonstrated for state-of-the-art high quality cantilevers with a SQUID-based magnetic detection [19,53]. [48], derived as in [22].…”

Section: Experimental Feasibilitymentioning

confidence: 99%

“…An example of experiment in which rotational measurements can in principle improve the bounds on CSL with respect to translational tests is the space mission LISA Pathfinder, whose preliminary data for the vibrational noise were already exploited to set upper bounds on the CSL parameters [22,23]. We can readily apply our model to LISA Pathfinder, with minimal variations to take into account the cubic instead of cylindrical geometry.…”

Section: Space-based Experimentsmentioning

confidence: 99%

“…Actually, the strongest bounds on the CSL parameters come from the second class of non-interferometric experiments, which are sensitive to small position displacements and detect CSL-induced diffusion in position [14][15][16]. Among them, measurements of spontaneous x-ray emission gives the strongest bound on λ for r C <10 −6 m [17,18], while force noise measurements on nanomechanical cantilevers [19][20][21] and on gravitational wave detectors give the strongest bound for r C >10 −6 m [22,23].…”

Section: Introductionmentioning

confidence: 99%

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Non-interferometric test of the continuous spontaneous localization model based on rotational optomechanics

et al. 2018

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The continuous spontaneous localization (CSL) model is the best known and studied among collapse models, which modify quantum mechanics and identify the fundamental reasons behind the unobservability of quantum superpositions at the macroscopic scale. Albeit several tests were performed during the last decade, up to date the CSL parameter space still exhibits a vast unexplored region. Here, we study and propose an unattempted non-interferometric test aimed to fill this gap. We show that the angular momentum diffusion predicted by CSL heavily constrains the parametric values of the model when applied to a macroscopic object.

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Section: Experimental Feasibilitymentioning

confidence: 99%

Section: Space-based Experimentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Non-interferometric test of the continuous spontaneous localization model based on rotational optomechanics

et al. 2018

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“…Figure 2 can be compared with Figure 2 in Ref. [22], where the mapping is obtained using other measurements. It is interesting to note that, for a collapse induced by a white noise, the allowed parameter space is confined to a drastically reduced region.…”

Section: Mapping Csl Parameters Spacementioning

confidence: 99%

CSL Collapse Model Mapped with the Spontaneous Radiation

Piscicchia

Bassi

Curceanu

et al. 2017

Entropy

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Abstract:In this paper, new upper limits on the parameters of the Continuous Spontaneous Localization (CSL) collapse model are extracted. To this end, the X-ray emission data collected by the IGEX collaboration are analyzed and compared with the spectrum of the spontaneous photon emission process predicted by collapse models. This study allows the obtainment of the most stringent limits within a relevant range of the CSL model parameters, with respect to any other method. The collapse rate λ and the correlation length r C are mapped, thus allowing the exclusion of a broad range of the parameter space.Keywords: quantum mechanics; the measurement problem; collapse models; X-rays The CSL Collapse ModelCollapse models are phenomenological models introduced to solve the measurement problem of quantum mechanics and explain the quantum-to-classical transition [1][2][3][4][5][6]. According to these models, the linear and unitary evolution given by the Schrödinger equation is modified by adding a non-linear term and the interaction with a stochastic noise field. These modifications have two very important consequences: (i) they lead to the collapse of the wave function of the system in space (localization mechanism) and (ii) the collapse effects get amplified with the mass of the system (amplification mechanism). The combination of these two properties guarantees that macroscopic objects always have well defined positions, explaining why we do not observe quantum behaviour at the macroscopic level. On the other hand, for microscopic systems, the effect of the non-linear interaction with the noise field is very small and their dynamics is dominated by the Schrödinger evolution. Due to the presence of the non-linear interaction with the noise field, collapse models predict slight deviations from the standard quantum mechanics predictions [7].The analysis discussed in this work sets limits on the characteristic parameters of the Continuous Spontaneous Localization (CSL) model [8][9][10], which is one of the most relevant and well-studied collapse models in the literature. In the CSL model, the state vector evolution is described by a modified Schrödinger equation which contains, besides the standard Hamiltonian, non-linear and stochastic terms, characterized by the interaction with a continuous set of independent noises w(x, t) (one for each point of the space, which is why this set is often referred to as "noise field") having zero average and white correlation in time, i.e., E[w(x, t)] = 0 and E[w(x, t)w(y, s)] = δ(x − y)δ(t − s) where E[...] denotes the average over the noises. Two phenomenological parameters (λ and r C ) are introduced in

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“…In our analysis, we will be interested in exploring the implications that the different expected values of γ have on the precision associated with a chosen strategy. Data coming from various experiments and performed at a broad range of energy scales tightly constrain the range of possible values for r c , which makes it unnecessary to invoke quantum estimation theory methods to further assess the variability of such parameter [25].…”

Section: The Model and The Core Resultsmentioning

confidence: 99%

Quantum-limited estimation of continuous spontaneous localization

et al. 2017

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We apply the formalism of quantum estimation theory to extract information about potential collapse mechanisms of the continuous spontaneous localisation (CSL) form. In order to estimate the strength with which the field responsible for the CSL mechanism couples to massive systems, we consider the optomechanical interaction between a mechanical resonator and a cavity field. Our estimation strategy passes through the probing of either the state of the oscillator or that of the electromagnetic field that drives its motion. In particular, we concentrate on all-optical measurements, such as homodyne and heterodyne measurements. We also compare the performances of such strategies with those of a spin-assisted optomechanical system, where the estimation of the CSL parameter is performed through time-gated spin-like measurements.Understanding the nature of the quantum-to-classical (QtC) transition is a long-sought problem that attracts an evergrowing attention [1][2][3][4][5][6]. While quantum mechanics has undergone exhaustive and extremely successful testings in the microscopic realm, the apparent absence of quantum manifestations at the macroscopic scale cries for a deeper understanding. In particular, this lack of evidence reinforces the need of assessing the causes for the emergence of classical mechanics from fundamental quantum evolution. The most widely accepted theory behind such process is quantum decoherence [6]: The environment surrounding any quantum system monitors its state continuously, practically collapsing the system's wavefunction and curtailing any quantum behaviour. Such process is conjectured to occur more quickly with the growing size of the system at hand. Under this regime, macroscopic superpositions would be possible in macroscopic systems perfectly isolated from their environment, a condition that is, for all practical purposes, not realisable.However, a set of theories, usually referred to as collapse models (CMs), suggests an alternative route to the explanation of the QtC transition by putting forward fundamental underlying mechanisms responsible for the collapse of the wavefunction [7]. The strength of this effect should increase with the size (mass) of the system, leaving microscopic (macroscopic) systems fully within the quantum (classical) realm. The key difference between CMs and standard quantum mechanics is that in the framework entailed by the former, perfectly isolated macroscopic objects would continue to act classically.Among the proposals put forward so far to test (or rule out) some of the currently formulated CMs [8][9][10], those based on the experimental platform of cavity optomechanics offer features of undemanding scalability of the mass of the system to be probed and high-sensitivity of measurement. Most remarkably, at variance with standardly pursued approaches [11], they bypass the need for the construction and quantum-limited management of large interferometers [12,13]. notwithstanding such promising features, the investigation of CMs still poses considerable experim...

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Experimental bounds on collapse models from gravitational wave detectors

Cited by 125 publications

References 43 publications

Non-interferometric test of the continuous spontaneous localization model based on rotational optomechanics

Non-interferometric test of the continuous spontaneous localization model based on rotational optomechanics

CSL Collapse Model Mapped with the Spontaneous Radiation

Quantum-limited estimation of continuous spontaneous localization

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