Coupled Systems

  • Karl BlumEmail author
Part of the Springer Series on Atomic, Optical, and Plasma Physics book series (SSAOPP, volume 64)


In Chap. 2 the basic equations of motion, (2.50) and the Liouville equation (2.52), were derived and applied to the description of interactions between a quantum system and an external classicalfield.In this chapter we will consider the problem of describing the state of a quantum system which is interacting with other (detected or undetected) quantumsystems.This is an important topic and is of central importance to the following discussions in this book.The quantum mechanical theorems which will be introduced provide the basis for the understanding of phenomena such as quantum beats, angular correlations, and spin-depolarization effects.In Sects. 3.1 and 3.2 we will describe the general theory which is required and in Sects. 3.3, and 3.4, and 3.5 we will give specific examples which illustrate the meaning and application of the theorems.


Density Matrix Entangle State Pure State Bell State Reduce Density Matrix 
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Copyright information

© Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  1. 1.Institut für Theoretische PhysikUniversität MünsterMünsterGermany

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