Probing the Quantum Nature of Gravity in the Microgravity of Space

TL;DR

This paper advocates for space-based experiments leveraging microgravity to explore the quantum nature of gravity, highlighting recent technological advances and proposing a coordinated research effort.

Contribution

It presents a comprehensive case for developing space-based quantum gravity experiments, combining recent quantum technologies with the unique environment of space.

Findings

Microgravity enables better control of quantum systems for gravity tests.

Recent quantum technologies make space-based experiments feasible.

A coordinated effort can advance understanding of quantum gravity.

Abstract

Conventionally, experiments probing the quantum nature of gravity were thought to be prohibitive due to the extremely high energy scales involved. However, recent and rapid advances at the intersection of quantum information and gravity, along with quantum technologies that allow preparation and control of mechanical systems in the quantum regime, indicate that such tests may well be within reach of upcoming experimental capabilities. The microgravity of space offers a unique environment to carry out this endeavor, allowing possibilities to control and manipulate delicate quantum characteristics in larger systems, better than current Earth-based setups. In this white paper, we lay out the science case for furthering a community effort to study and lead progress in both theoretical and experimental aspects for space-based tests of fundamental physics, particularly to probe the elusive quantum nature of gravity.