Walk through (Score 1)

There is a nice walk through of the operation of the device on the Leigh group site at- http://www.catenane.net/ What makes this work noteworthy is that the particle is 'ratcheted' into one position in preference to the other, despite the binding energy at each position being similar. The device is a prototype of an 'information ratchet'. There is no suggestion of breaking any laws of thermodynamics because the operation of the device is driven by an external power source (UV irradiation), which will pay back any entropic cost of 'sorting' all of the devices into one state.