Quantum interference between independent reservoirs in open quantum   systems
  When a quantum system interacts with multiple reservoirs, the environmental effects are usually treated in an additive manner. We show that this assumption breaks down for non-Markovian environments that have finite memory times. Specifically, we demonstrate that quantum interferences between independent environments can qualitatively modify the dynamics of the physical system. We illustrate this effect with a two level system coupled to two structured photonic reservoirs, discuss its origin using a non-equilibrium diagrammatic technique, and show an example when the application of this interference can result in an improved dark state preparation in a $\lambda$ system. 
Ching-Kit Chan, Guin-Dar Lin, Susanne F. Yelin, Mikhail D. Lukin
quant-ph cond-mat.quant-gas