Restrictions on information transfer in quantum measurements
Information-theoretical restrictions on the information transfer in quantum measurements are studied for practical systems. For the measurement of quantum system S by information system O such restrictions are described by a formalism of inference maps in Hilbert space, the resulting O restricted states xi(O) calculated from the agreement with Schrodinger S, O dynamics. It is shown that the principal S information losses stipulate the stochasticity of measurement outcomes; consequently xi(O) describes the random "pointer" outcomes q(j) observed by O in the individual events.
information transfer quantum measurements quantum information