Some Models of “Quantum Measurement”
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In this chapter, we shall describe several specific models of “small” quantum mechanical systems interacting with (“measured by”) the “large” quantal system, whose elementary subsystems interact by short range interactions. The macroscopic/classical variables of the infinite systems will change now due to the interaction with the “small system” in the limit of infinite time only, with very slow convergence to the changed value of the “pointer position”. A model of a large but finite “measuring apparatus”, in which the convergence to the final “measurement result” is, on the other hand, very quick, is proposed as well.