Department of Molecular and Optical Physics - University of Freiburg, Germany.
Modeling and control of entanglement dynamics in laser cooling of trapped atoms
Maryam Roghani, Heinz-Peter Breuer, and Hanspeter Helm
Department of Molecular and Optical Physics, University of Freiburg, Stefan-Meier-Strasse 19, 79104 Freiburg, Germany
Phys. Rev. A 85, 012313 (2012) [11 pages]
We discuss the dynamical behavior of the entanglement between the internal and the external degrees of freedom of a trapped atom in electromagnetically induced transparency laser cooling. It is shown that essential features of the intricate entanglement dynamics observed in full numerical simulations of the underlying quantum master equation can be understood in terms of a two-state model on the basis of Landau-Zener splittings in the atom-laser field Hamiltonian. An extension of this model to an effective non-Hermitian Hamiltonian is constructed which describes the decay of entanglement by spontaneous emission processes. We also discuss schemes for the control of entanglement and demonstrate that a permanent entanglement can be imprinted on trapped atoms through a rapid switch-off of the driving fields.
©2012 American Physical Society
PACS: 03.67.Bg, 03.65.Yz, 37.10.De