Probing the Quantum Nature of Gravity in the Microgravity of Space.

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.