Emergence of classical behavior from the quantum spin

Details Emergence of classical behavior from the quantum spin Emergence of classical behavior from the quantum spin

2012-02-09

arxiv.org/abs/1202.2044v1

Physics

Quantum Physics

Scientific paper

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.

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