Measurement and Classical Regime in Quantum Mechanics

This chapter provides an up-to-date discussion of work on two distinct problems in the foundations of quantum mechanics: the problem of the classical regime and the measurement problem. It explains that contemporary work has focused on the role of environmental decoherence in the emergence of classical kinetics and dynamics, and argues that the success of appeals to decoherence to solve the problem depends on the interpretation of the quantum theory. The chapter also considers the collapse postulate, the Born rule, and the apparatus of positive operator value measures.