  We propose using an array of potential wells as an interferometer, in which
the beam splitters are provided by tunneling during an appropriate time through
the barrier between wells. This arrangement allows demonstration of generalized
Hong-Ou-Mandel effects with multiple particles traversing one or several beam
splitters. Other interferometer effects can occur, including a violation of the
Bell-Clauser-Horne-Shimony-Holt form of the Bell inequality. With interactions,
one sees various effects including so-called fermionization, collective
tunneling, and self-trapping.
