QUANTUM PREDICTION ALGORITHMS

The consistent histories formulation of the quantum theory of a closed system with a pure initial state defines an infinite number of incomp atible consistent sets, each of which gives a possible description of the physics; We investigate the possibility of using the properties of the Schmidt decomposition to define an algorithm which selects a sing le, physically natural, consistent set. We explain the problems which arise, set out some possible algorithms, and explain their properties with the aid of simple models. Though the discussion is framed in the language of the consistent histories approach, it is intended to highl ight the difficulty in making any interpretation of quantum theory bas ed on decoherence into a mathematically precise theory.