Title: Digital quantum simulations of quantum electrodynamics
Abstract: Digital quantum simulations of gauge theories are an active field of research within the community of lattice simulations of gauge theories. I will focus on digital quantum simulations of the Schwinger Model with theta-term. This is a U(1) gauge theory which exhibits confinement, and by probing the system from the outside with two charged objects it is possible to observe an analogous process to string breaking. Placing the gauge theory on a lattice yield a discretized version that can be simulated on (quantum) computers.
I will present two techniques, one for estimating the eigenenergies of the lattice theory and another auxiliary algorithm for suppressing high-energy excitations. This two newly introduced algorithms combine to give very precise estimations for ground state energy both for the Schwinger Model and for the string breaking picture.