  A simple one dimensional model for the system-apparatus interaction is
analyzed. The system is a spin-1/2 particle, and its position and momentum
degrees constitutes the apparatus. An analysis involving only unitary
Schrodinger dynamics illustrates the nature of the correlations established in
the system-apparatus entangled state. It is shown that even in the absence of
any environment-induced decoherence, or any other measurement model, certain
initial states of the apparatus - like localized Gaussian wavepackets - are
preferred over others, in terms of the establishment of measurementlike
one-to-one correlations in the pure system-apparatus entangled state.
