Improved Noninterferometric Test of Collapse Models Using Ultracold Cantilevers

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

doi:10.1103/physrevlett.119.110401

Cited by 125 publications

(188 citation statements)

References 37 publications

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“…This means that the effective λ for bulk heating is at most 3.1 × 10 −11 s −1 , ruling out a collapse model white-noise interpretation of the excess noise reported in Ref. [3].…”

Section: Introduction and Comparison Of Bounds On Effective Noise supporting

confidence: 52%

“…Thus, if the noise reported in Ref. [3] at the very low cantilever frequency of 8174 s −1 were due to CSL, it would be further evidence for nonwhite CSL model noise.…”

Section: Introduction and Comparison Of Bounds On Effective Noise mentioning

confidence: 86%

“…with ρ being the density in units of g/cm 3 . We consider two geometries for which the heat transport problem is effectively one dimensional and easily solved:…”

Section: Alternative Experiments For Bounding λ Effmentioning

confidence: 99%

“…The steadystate surface temperature of the sphere T 1 is determined by equatingQ sphere toQ transport . Taking as an example the density of lead ρ = 11.4 g/cm 3 , and a sphere of radius R = 50 cm (which would fit in the CUORE underground experiment cryostat [11]), we havė…”

Section: Alternative Experiments For Bounding λ Effmentioning

confidence: 99%

“…Thus, it is timely to consider further experiments [4] which could detect or rule out a noise coupling with the strength suggested by Ref. [3].…”

Section: Introduction and Comparison Of Bounds On Effective Noise mentioning

confidence: 95%

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Bulk heating effects as tests for collapse models

Adler

Vinante

2018

Phys. Rev. A

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We discuss limits on the noise strength parameter in mass-proportional-coupled wave-function collapse models implied by bulk heating effects and examine the role of the noise power spectrum in comparing experiments of different types. This comparison utilizes a calculation of the rate of heating through phonon excitation implied by a general noise power spectrum λ(ω). We find that, in the standard heating formula, the reduction rate λ is replaced by λ eff = 2 3π 3/2, with ω L ( q ) being the longitudinal acoustic-phonon frequency as a function of wave number q, and with r C being the noise correlation length. Hence if the noise power spectrum is cut off below ω L (| q | ∼ r −1 c ), the bulk heating rate is sharply reduced, allowing compatibility with current experimental results. We suggest possible new bulk heating experiments that can be performed subject to limits placed by natural heating from radioactivity and cosmic rays. The proposed experiments exploit the vanishing of thermal transport in the low-temperature limit.

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“…This means that the effective λ for bulk heating is at most 3.1 × 10 −11 s −1 , ruling out a collapse model white-noise interpretation of the excess noise reported in Ref. [3].…”

Section: Introduction and Comparison Of Bounds On Effective Noise supporting

confidence: 52%

“…Thus, if the noise reported in Ref. [3] at the very low cantilever frequency of 8174 s −1 were due to CSL, it would be further evidence for nonwhite CSL model noise.…”

Section: Introduction and Comparison Of Bounds On Effective Noise mentioning

confidence: 86%

“…with ρ being the density in units of g/cm 3 . We consider two geometries for which the heat transport problem is effectively one dimensional and easily solved:…”

Section: Alternative Experiments For Bounding λ Effmentioning

confidence: 99%

Section: Alternative Experiments For Bounding λ Effmentioning

confidence: 99%

“…Thus, it is timely to consider further experiments [4] which could detect or rule out a noise coupling with the strength suggested by Ref. [3].…”

Section: Introduction and Comparison Of Bounds On Effective Noise mentioning

confidence: 95%

See 3 more Smart Citations

Bulk heating effects as tests for collapse models

Adler

Vinante

2018

Phys. Rev. A

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Nanomechanical Dissipation and Strain Engineering

Sementilli

Romero

Bowen

2021

Adv Funct Materials

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Nanomechanical resonators have applications in a wide variety of technologies ranging from biochemical sensors to mobile communications, quantum computing, inertial sensing, and precision navigation. The quality factor of the mechanical resonance is critical for many applications. Until recently, mechanical quality factors rarely exceeded a million. In the past few years however, new methods have been developed to exceed this boundary. These methods involve careful engineering of the structure of the nanomechanical resonator, including the use of acoustic bandgaps and nested structures to suppress dissipation into the substrate, and the use of dissipation dilution and strain engineering to increase the mechanical frequency and suppress intrinsic dissipation. Together, they have allowed quality factors to reach values near a billion at room temperature, resulting in exceptionally low dissipation. This review aims to provide a pedagogical introduction to these new methods, primarily targeted to readers who are new to the field, together with an overview of the existing state‐of‐the‐art, what may be possible in the future, and a perspective on the future applications of these extreme‐high quality resonators.

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Irreversibility in an Optical Parametric Driven Optomechanical System

Abah,

Edet,

Ali

et al. 2023

Annalen der Physik

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This study investigates the role of nonlinearity via optical parametric oscillator on the entropy production rate and quantum correlations in a hybrid optomechanical system. Specifically, the modified entropy production rate of an optical parametric oscillator placed in the optomechanical cavity is derived, which is well described by the two‐mode Gaussian state. The irreversibility and quantum mutual information associated with the driving the system far from equilibrium are found to be controlled by the phase and strength of nonlinearity. This analysis shows that the system entropy flow, heating, or cooling, are determined by choosing the appropriate phase of the self‐induced nonlinearity. It is further demonstrated that this effect persists for a reasonable range of cavity decay rate.

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Improved Noninterferometric Test of Collapse Models Using Ultracold Cantilevers

Cited by 125 publications

References 37 publications

Bulk heating effects as tests for collapse models

Bulk heating effects as tests for collapse models

Nanomechanical Dissipation and Strain Engineering

Irreversibility in an Optical Parametric Driven Optomechanical System

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