Quantum Interferometry Meets General Relativity

The interplay between Einstein’s theory of gravity and quantum mechanics remains one of the open questions in physics. Each of the theories has been confirmed individually, but phenomena described by the two usually take place at very different physical regimes. Nevertheless, gravity can affect quantum systems and some aspects of the interplay can be probed in experiments. In this talk, I will discuss a quantum version of the "twin paradox" in which a clock is brought in superposition of being at two different gravitational potentials. The effect leads to new and measurable consequences at the interplay between quantum theory and general relativity and causes decoherence of composite quantum systems. I will also discuss how these effects can be accessed in quantum interference experiments.