  A two-body quantum correlation is calculated for a particle and an infinite
potential well in which it is trapped or either a barrier or finite well over
which it traverses. Correlated interference results when the incident and
reflected particle substates and their associated well or barrier substates
overlap. Measurement of the particle in this region causes a splitting of the
well or barrier substate at subsequent times. The joint probability density,
which is a function both of the different positions and different times at
which the particle and well or barrier are measured, is derived assuming that
no interaction occurs between the time each is measured.
