Europhys. Lett.
Volume 74, Number 5, June 2006
Page(s) 771 - 777
Section General
Published online 12 April 2006
Europhys. Lett., 74 (5), pp. 771-777 (2006)
DOI: 10.1209/epl/i2006-10028-6

Scattering-induced dynamical entanglement and the quantum-classical correspondence

M. Lombardi and A. Matzkin

Laboratoire de Spectrométrie physique (CNRS Unité 5588), Université Joseph-Fourier Grenoble-1 - BP 87, 38402 Saint Martin d'Hères, France

received 9 January 2006; accepted in final form 30 March 2006
published online 12 April 2006

The generation of entanglement produced by a local potential interaction in a bipartite system is investigated. The degree of entanglement is contrasted with the underlying classical dynamics for a Rydberg molecule (a charged particle colliding on a kicked top). Entanglement is seen to depend on the structure of classical phase-space rather than on the global dynamical regime. As a consequence, regular classical dynamics can in certain circumstances be associated with higher entanglement generation than chaotic dynamics. In addition, quantum effects also come into play: for example, partial revivals, which are expected to persist in the semiclassical limit, affect the long-time behaviour of the reduced linear entropy. These results suggest that entanglement may not be a pertinent universal signature of chaos.

03.67.Mn - Entanglement production, characterization, and manipulation.
05.45.Mt - Quantum chaos; semiclassical methods.
34.60.+z - Scattering in highly excited states (e.g., Rydberg states).

© EDP Sciences 2006