# Macroscopicity of quantum mechanical superposition tests via hypothesis falsification

## TL;DR

This paper introduces an objective Bayesian framework to quantify the macroscopicity of quantum superposition tests by analyzing experimental data and measurement uncertainties, applicable to various quantum experiments.

## Contribution

It presents a novel, data-driven measure of macroscopicity based on hypothesis falsification, applicable to diverse quantum tests and experiments.

## Key findings

- Quantifies macroscopicity for Bose-Einstein condensate interference
- Assesses Leggett-Garg tests with atomic random walks
- Evaluates entanglement in nanomechanical oscillators

## Abstract

We establish an objective scheme to determine the macroscopicity of quantum mechanical superposition tests, which is based on the Bayesian hypothesis falsification of macrorealistic modifications of quantum theory. The measure uses the raw data gathered in an experiment, taking into account all measurement uncertainties, and can be used to directly assess any conceivable quantum test. We determine the resulting macroscopicity for three recent tests of quantum physics: double-well interference of Bose-Einstein condensates, Leggett-Garg tests with atomic random walks, and entanglement generation and read-out of nanomechanical oscillators.