  We present a preliminary theoretical and experimental study of quantum
projectors implemented by integrated optical directional couplers fabricated by
ion-exchange Na/K processes in soda-lime glass. Theoretical considerations
about devices formed by concatenated 2x2 directional couplers are presented in
order to show their capabilities for implementing N-dimensional quantum
projective measurements, and concomitantly the production of 1-qudit states.
Since the fundamental unit of these devices are 2x2 directional couplers, we
present an experimental study for obtaining, by an optical characterization,
empiric relationships between fabrication and optical parameters of such
couplers. Likewise, a two-dimensional quantum projector is demonstrated in such
a way that projective measurements are obtained for the states of X (diagonal)
and Y (circular) bases.
