Ultracold Bose gases in dynamic disorder with tunable correlation time.

We experimentally study the dissipative dynamics of ultracold bosonic gases in a dynamic disorder potential with tunable correlation time, realizing an open quantum system with a controlled coupling spectrum. For thermal clouds, we measure the correlation-time dependent heating rate and identify the microscopic origin of dissipation for time-dependent potentials. For a Bose-Einstein condensate, we observe a crossover from a regime dominated by heating mediated through the residual thermal cloud to one characterized by superfluid excitations. We support our observations by an open-system rate model capturing the particle loss rate in both regimes. Our results shed light on the dissipative dynamics of driven disordered systems and points toward investigating the interplay between localization and drive-induced dephasing in the full dynamic range from static disorder to white noise.