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The Diffusion of Passive Tracers in Laminar Shear Flow
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Collapse Dynamics Are Diffusive.

Sandro Donadi1, Luca Ferialdi2, Angelo Bassi3

  • 1Centre for Quantum Materials and Technologies, School of Mathematics and Physics, Queen's University, Belfast BT7 1NN, United Kingdom.

Physical Review Letters
|June 24, 2023
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Summary
This summary is machine-generated.

Noninterferometric experiments test quantum collapse models by detecting diffusive motion. This study proves that any spatial wave function collapse dynamics must exhibit diffusive properties, broadening experimental reach for quantum mechanics.

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Area of Science:

  • Quantum Mechanics
  • Foundations of Physics

Background:

  • Spontaneous wave function collapse models predict deviations from quantum superposition for large systems.
  • Noninterferometric experiments have previously constrained collapse models by detecting noise-induced diffusive motion.

Purpose of the Study:

  • To demonstrate that any spatial wave function collapse dynamics, not just noisy ones, must exhibit diffusive properties.
  • To broaden the applicability of noninterferometric experiments to a wider range of collapse models.

Main Methods:

  • Theoretical analysis of collapse dynamics under reasonable assumptions.
  • Mathematical proof based on space-translation covariance and the no-signaling constraint.

Main Results:

  • Any spatial wave function collapse dynamics is shown to be inherently diffusive.
  • Collapse models must alter the average momentum and/or its spread of a quantum system.

Conclusions:

  • The noninterferometric approach is broadly applicable to testing spatial wave function collapse models.
  • This work provides a theoretical foundation for designing new experiments to probe fundamental quantum mechanics.