  We demonstrated stochastic switching in a bistable system implemented with
Rydberg atomic ensemble. The transition between the two states of the bistable
system is driven by intensity noise of the laser beams. Rydberg atomic ensemble
accumulates energy in an equilibrium situation and brings the nonlinear system
across the threshold, where stochastic switching occurs between the two states.
Measurement of Rydberg state's population by means of the ladder-type
electromagnetically-induced transparency approaching relevant Rydberg state
allows us to investigate the nonlinear behavior in Rydberg atomic ensemble
based bistable system experimentally.
