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Upper Bounds on Spontaneous Wave-Function Collapse Models Using Millikelvin-Cooled Nanocantilevers.

A Vinante1,2, M Bahrami3,4, A Bassi3,4

  • 1Istituto Nazionale di Fisica Nucleare (INFN), TIFPA, I-38123 Povo, Trento, Italy.

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|March 19, 2016
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Summary
This summary is machine-generated.

This study experimentally constrains collapse models by measuring the thermal noise of a nanocantilever. The findings significantly improve previous bounds on the continuous spontaneous localization collapse rate, impacting quantum mechanics research.

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Area of Science:

  • Quantum Mechanics
  • Experimental Physics
  • Condensed Matter Physics

Background:

  • Collapse models propose a slight violation of energy conservation due to spontaneous wave function collapse.
  • This predicted violation offers a pathway for experimental verification and setting bounds on model parameters.
  • Ultrasoft nanocantilevers cooled to millikelvin temperatures are sensitive probes for detecting subtle physical phenomena.

Purpose of the Study:

  • To experimentally determine upper bounds on the continuous spontaneous localization (CSL) collapse rate.
  • To investigate the potential violation of energy conservation predicted by collapse models.
  • To refine existing experimental constraints on CSL parameters, particularly the correlation length (rC).

Main Methods:

  • Utilizing an ultrasoft magnetically tipped nanocantilever cooled to millikelvin temperatures.
  • Accurately estimating the thermal noise of the cantilever's fundamental mode within a 0.03-1 K range.
  • Analyzing measured data and cantilever geometry to derive collapse rate bounds.

Main Results:

  • Established new upper bounds for the CSL collapse rate across a broad range of correlation lengths (rC).
  • Significantly improved upon previous experimental constraints for rC > 10^-6 m.
  • Partially excluded the enhanced collapse rates proposed by Adler's model.

Conclusions:

  • The experiment provides stringent new limits on collapse model parameters, particularly for larger correlation lengths.
  • The findings contribute to narrowing the parameter space for theories predicting wave function collapse.
  • Future experimental refinements could further enhance the sensitivity and push these bounds even further.