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A localized free particle is represented by a wave packet and its motion isdiscussed in most quantum mechanics textbooks. Implicit in these discussions isthe assumption of zero temperature. We discuss how the effects of finitetemperature and squeezing can be incorporated in an elementary manner. Theresults show how the introduction of simple tools and ideas can bring thereader into contact with topics at the frontiers of research in quantummechanics. We discuss the standard quantum limit, which is of interest in themeasurement of small forces, and decoherence of a mixed (``Schrodinger cat'')state, which has implications for current research in quantum computation,entanglement, and the quantum-classical interface

Wave packet spreading: Temperature and squeezing effects with applications to quantum measurement and decoherence