Sprecher
Beschreibung
Digital quantum simulators provide a table-top platform for addressing salient questions in lattice gauge theories (LGTs). In this talk, I will present a recent work where we implemented a Z2 lattice gauge theory on the Google Sycamore chips within the Google Early Access Program. We synthesize the charge--gauge-field interaction using only 6 native two-qubit gates, enabling us to reach simulation times of up to 25 Trotter steps. We observe how tuning a term that couples only to the electric field confines the charges, a manifestation of the tight bond that the local gauge constraint generates between both. Moreover, we study a different mechanism, where a modification of the gauge constraint from a Z2 to U(1) symmetry freezes the system dynamics. This modification is achieved by the addition of a linear symmetry protecting term, illustrating also the potential power of protecting gauge symmetries via energy penalties. Our work showcases the dramatic restriction that the underlying gauge constraint imposes on the dynamics of an LGT and it illustrates how gauge constraints can be modified and protected.
