To understand quantum dynamics it is essential to realize that observable systems are always subsystems of a larger one — ultimately of the whole universe. The notion of an isolated system makes sense only as an approximation depending on the concrete situation. This point of view has been emphasized in the preceding chapters as the basis of the whole book. This chapter presents a selfcontained discussion of the dynamics of a subsystem (including the Markovian approximation). The resulting equations are then formally identical with stochastic modifications of the Schrödinger equation which have been proposed by some authors as a priori modifications of the Hamiltonian dynamics and which will be discussed in Chap. 8.


Entropy Coherence Verse 


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© Springer-Verlag Berlin Heidelberg 1996

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  • J. Kupsch

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