ENTANGLED VIBRATIONAL-STATES IN POLYATOMIC-MOLECULES

The vibrational state of a polyatomic molecule excited with a transfor m limited light pulse is determined analytically. We analyze how the p roperties of the vibrational state depend on the duration of the excit ing pulse and the possible geometrical configurations of the nuclear p otential surfaces. It is pointed out that a finite exciting pulse resu lts in an entangled vibrational state. The magnitude of the entangleme nt is described by the von Neumann entropy associated with the vibrati onal modes. It is shown that in the case of a very short excitation, t he change of the geometrical configuration of the vibrionic potential surface may also lead to entanglement.