Current experimental upper bounds on spacetime diffusion

Physical Review Research, vol. 6

Abstract

A theory describing the dynamics of quantum systems interacting on a classical spacetime was recently put forward by Oppenheim Quantum states may retain their coherence, at the cost of some amount of stochasticity of the spacetime metric, characterized by a spacetime diffusion parameter. Here, we report existing experimental upper bounds on such spacetime diffusion, based on a review of several types of experiments with very low force noise over a broad range of test masses from single atoms to several kilograms. We find an upper bound at least 15 orders of magnitude lower as compared to the initial bounds for explicit models presented by Oppenheim . The results presented here provide a path forward for future experiments that can help evaluate classical-quantum theories. Published by the American Physical Society 2024

Authors 5

1. Martijn Janse Aachen

   Leiden University

   Affiliation as printed

   Leiden University

2. Dennis G. Uitenbroek Aachen

   Leiden University

   Affiliation as printed

   Leiden University

3. Loek van Everdingen Aachen

   Leiden University

   Affiliation as printed

   Leiden University

4. Jaimy Plugge Aachen

   Leiden University

   Affiliation as printed

   Leiden University

5. Tjerk H. Oosterkamp Aachen

   Leiden University

   Affiliation as printed

   Leiden University