1202.2044 (M. Radonjic et al.)

Emergence of classical behavior from the quantum spin    [PDF]

M. Radonjic, S. Prvanovic, N. Buric

Classical Hamiltonian system of a point moving on a sphere of fixed radius is
shown to emerge from the constrained evolution of quantum spin. The constrained
quantum evolution corresponds to an appropriate coarse-graining of the quantum
states into equivalence classes, and forces the equivalence classes to evolve
as single units representing the classical states. The coarse-grained quantum
spin with the constrained evolution in the limit of the large spin becomes
indistinguishable from the classical system.

View original: http://arxiv.org/abs/1202.2044