DEFINITION OF LYAPUNOV EXPONENTS AND KS ENTROPY IN QUANTUM DYNAMICS

SCHWENGELBECK U, Faisal F. DEFINITION OF LYAPUNOV EXPONENTS AND KS ENTROPY IN QUANTUM DYNAMICS. PHYSICS LETTERS A. 1995;199(5-6):281-286.We propose a definition of quantum Lyapunov exponents and the associated KS entropy, which allows a rigorous characterization of regular or irregular quantum dynamics in the same terms as in classical dynamics. An illustration of the use of this concept is given for the quantum standard map