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Dynamical chaos versus quantum interference
Valentin V. Sokolov, Giuliano Benenti, Giulio Casati
We discuss the dephasing induced by the internal classical chaotic motion in the absence of any external environment. To this end a new extension of fidelity for mixed states is in…
Reversible and irreversible dynamics of a qubit interacting with a small environment
Giuliano Benenti, G. Massimo Palma
We analyze the dynamics of a system qubit interacting by means a sequence of pairwise collisions with an environment consisting of just two qubits. We show that the density operato…
Many-body quantum ratchet in a Bose-Einstein condensate
Dario Poletti, Giuliano Benenti, Giulio Casati +1
We study the dynamics of a dilute Bose-Einstein condensate confined in a toroidal trap and exposed to a pair of periodically flashed optical lattices. We first prove that in the no…
Conservative chaotic map as a model of quantum many-body environment
Davide Rossini, Giuliano Benenti, Giulio Casati
We study the dynamics of the entanglement between two qubits coupled to a common chaotic environment, described by the quantum kicked rotator model. We show that the kicked rotator…
Chaotic ratchet dynamics with cold atoms in a pair of pulsed optical lattices
Gabriel G. Carlo, Giuliano Benenti, Giulio Casati +4
We present a very simple model for realizing directed transport with cold atoms in a pair of periodically flashed optical lattices. The origin of this ratchet effect is explained a…