Composite quantum systems at the interface with general relativity*

A major goal of modern physics is to understand and test the regime where quantum mechanics and general relativity both play a role. However, new effects of this regime are usually thought to be relevant only at high energies or in strong gravitational fields, beyond the reach of present-day experiments. I will discuss a novel framework for achieving this goal, focused on low-energy but composite quantum systems and using the tools of quantum information science. Quantum coherence of composite particles can be measurably affected by general relativity even at low-energies and in weak gravitational fields through time dilation. I will explain the resulting new phenomena and how they can be tested. I will discuss broader relevance of the approach for quantum sensing, communication and quantum information processing.