Noise Induced Current in a Double-Well Trap

We study the behaviour of cold atoms trapped in optical double well potentials in the presence of noise, either generated by an external environment or by the trap itself. We show that quite in general the noise can induce a current between the two wells even when tunneling between the two wells is highly suppressed (Mott insulator phase). An engineered environment could provide a test ground for the behaviour of such a current.