  A discrete path integral formalism is used to obtain the transition amplitude
between 'sources' (slits and detector) in the twin-slit experiment of quantum
mechanics. This method explicates the normally tacit construct of dynamic
entities with temporal duration. The resulting amplitude is compared to that of
Schrodinger dynamics in order to relate 'source' dynamics and spatial
separation. The implied metric embodies non-separability, in stark contrast to
the metric of general relativity. Thus, this approach may have implications for
quantum gravity.
