Kwapien J., Slomczynski W., Zyczkowski K.
Coherent States Measurement Entropy
(85K, tex)
ABSTRACT. Coherent states (CS) quantum entropy can be split into two components.
The dynamical entropy is linked with the dynamical properties of a quantum
system. The measurement entropy, which tends to zero in the semiclassical
limit, describes the unpredictability induced by the process of a quantum
approximate measurement. We study the CS--measurement entropy for spin
coherent states defined on the sphere discussing different methods dealing
with the time limit $n \to \infty$. In particular we propose an effective
technique of computing the entropy by iterated function systems. The
dependence of CS--measurement entropy on the character of the partition of
the phase space is analysed.