Gerhard Paulus of Texas A&M University and co-workers in Berlin have developed a new look for Young's double-slit experiment. Interference pattern has been observed with electrons that pass through a double slit in time, not space, as a result of being ejected from an atom at one of two possible times by a laser pulse.

http://physicsweb.org/articles/news/9/3/1/1

that's interesting---but i am confused by the term 'how we look at it.'---this 'simple' modification of the ol' 'double-slit' should be of interest to those working on 'quantum-computers', as it involves a 'zero' or '1' response.