Highly non-classical states are produced in polarized neutron spin precessi
on experiments due to the coherent superposition of spin-up and spin-down s
tates. These states are described within the Wigner function formalism and
the measured momentum modulation in a neutron spin precession experiment is
taken as a sign of such non-classical states. (C) 2000 Elsevier Science B.
V. All rights reserved.