Quantum Quenches from Quantum Field Theory

What happens when a quantum system is exposed to a sudden disturbance, known as a quantum quench? Answering questions about the time development of a quantum system after a quench is of topical interest for the entire quantum community from condensed matter experimentalists working with cold atoms to scientists working within the realm of quantum information theory. Surprisingly, key information for addressing such questions can be extracted from results obtained by the PI and collaborators in connection with the exact solution of quantum field theories, where the quench is related to the introduction of a defect. With the present project we wish to apply the methods and results from quantum field theory to answer questions about the post-quench behavior for specific quantum systems outside the traditional realm of condensed matter physics. Via these efforts we will in addition generate new data needed to push forward a new emerging research field within quantum field theory.