Macroscopic Quantum Resonators Path Finder (MAQRO-PF) White Paper

TL;DR

This white paper proposes a space-based optical levitation experiment to investigate the upper size limits of quantum superpositions, aiming to test quantum mechanics at macroscopic scales beyond current experimental capabilities.

Contribution

It introduces a novel space platform concept for macroscopic quantum experiments, addressing gravitational limitations of terrestrial setups.

Findings

Designs for the satellite platform are summarized.

Payload requirements and development status are outlined.

The proposal aims to push quantum superposition size limits.

Abstract

Optically levitated particles are used in a wide range of experiments to explore both fundamental physics and to act as sensors to a variety of external forces. One field of particular interest that these particles can be used to investigate is quantum mechanics. Previous research has yet to set an absolute upper bound on the size of objects that can be prepared in a quantum superposition. Exploring this limit involves allowing ever-larger objects to freely and coherently evolve to assess if their behaviour matches quantum or classical theoretical predictions. However, the long free evolution times required for these behaviours to be visible result in the experiments being gravitationally limited. Space based platforms therefore become the next key step in these investigations. In this white paper, we shall discuss our proposal for an optical levitation experiment in space that will explore the fundamental upper size limits of quantum mechanics. We shall cover the scientific motivation behind these investigations, then summarize the current status of our designs for the satellite. We will then review the aspects of the payload that require further development, then summarize the current estimates of the payload's requirements.