Speaker
Description
A complete understanding of classical-quantum correspondence in the chaotic limit is still lacking. We study this correspondence from a quantum information-theoretic perspective in a quantum kicked top model. This is a multiqubit system whose dynamics is governed by successive twists and turns of the collective angular momentum operator. This system is of particular interest because it displays bifurcations, regular behaviour as well as chaotic behaviour in the classical limit, and is one of the few systems that has been experimentally realized in the quantum regime. We analyse the dynamics of different measures of quantum correlations, including Bell correlation functions, entanglement entropy and quantum discord among the qubits in the kicked top system. We find a new correspondence between classical phase space structures and time averaged Bell correlation functions. We also identify signatures of classical bifurcations in the time-averaged entanglement entropy. Our analysis provides new insight into the effects of classical chaos on the dynamics of systems in a deeply quantum regime.
