Theory Department
Max Planck Institute of Microstructure Physics
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Matos Abiague, A. S., Berakdar, J.

Geometric origin of dynamically induced freezing of quantum evolution
Physical Review A 73, (2),pp 024102/1-4 (2006)
The phenomenon of dynamical, field-induced freezing of quantum evolution is discussed. It occurs when a time-dependent state is dynamically driven in such a way that the evolution of the corresponding wave function is effectively localized within a small region in the projective Hilbert space. As a consequence, the dynamics of the system is frozen and the expectation values of all physical observables hardly change with time. Necessary and sufficient conditions for inducing dynamical freezing are inferred from a general analysis of the geometry of quantum evolution. The relevance of the dynamical freezing for a sustainable in time, dynamical control is discussed and exemplified by a study of the coherent control of the kicked rotor motion.

TH-2006-12