Non-Markovian Dynamics in Ultracold Rydberg Aggregates
  We propose a setup of an open quantum system in which the environment can be tuned such that either Markovian or non-Markovian system dynamics can be achieved. The implementation uses ultracold Rydberg atoms, relying on their strong long-range interactions. Our suggestion extends the features available for quantum simulators of molecular systems employing Rydberg aggregates and presents a new test bench for fundamental studies of the classification of system-environment interactions and the resulting system dynamics in open quantum systems. 
M. Genkin, D. W. Sch\"onleber, S. W\"uster and A. Eisfeld
quant-ph