Partial synchronisation of stochastic oscillators through hydrodynamic   coupling
  Holographic optical tweezers are used to construct a static bistable optical potential energy landscape where a Brownian particle experiences restoring forces from two nearby optical traps and undergoes thermally activated transitions between the two energy minima. Hydrodynamic coupling between two such systems results in their partial synchronisation. This is interpreted as an emergence of higher mobility pathways, along which it is easier to overcome barriers to structural rearrangement. 
Arran Curran, Michael P. Lee, Roberto Di Leonardo, Jonathan M. Cooper   and Miles J. Padgett
cond-mat.mes-hall physics.optics