  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.
