Abstract
© Willi-Hans Steeb, Yorick Hardy and Jacqueline de Greef, 2012 Available online: http://arxiv.org/abs/1110.4204v2
We study finite-dimensional product Hilbert spaces, coupled spin systems,
entanglement and energy level crossing. The Hamilton operators are based
on the Pauli group. We show that swapping the interacting term can lead from unentangled
eigenstates to entangled eigenstates and from an energy spectrum with
energy level crossing to avoided energy level crossing.