Information Entropy Squeezing for a Atom in Mode-Mode Competition System

The entropy squeezing properties for a two-levelatom interacting with a two-mode field via two different competing transitionsare investigated from a quantum information point of view. The influencesof the initial state of the system and the relative coupling strength between the atom and the fieldon the atomic information entropy squeezing are discussed. Our results show thatthe squeezed direction and the frequency of the information entropy squeezingcan be controlled by choosing the phase of the atom dipole and the relative competingstrength of atom-field, respectively.We find that, under the same condition, no atomic variance squeezing is predicted from theHUR while optimal entropy squeezing is obtained from the EUR, so the quantum information entropy is a remarkable precision measure for the atomic squeezingin the considered system.