He Ze-Long( ) a)b) , Lü Tian-Quan( ) a) † , Cui Lian( ) a) , Xue Hui-Jie( ) a)c) , Li Lin-Jun( ) a)b) , and Yin Hai-Tao( ) c) a) Center for Condensed-

Generation of arbitrary four-atom entangled decoherence-free states *Ji Xin(计 新) a)b) † , Lü Tian-Quan(吕天全) a) , and Zhang Shou(张 寿) a)b) ‡ a) Center for the Condensed-

Based on the transverse Ising model in the framework of the mean field approximation, this paper discusses a ferroelectric bilayer film with the surface transition layers within each constituent slab and an antiferroelectric interfacial coupling between two slabs. The hysteresis loop of a bilayer film is investigated. The results show that the surface transition layer in a ferroelectric bilayer film plays a significant role in realizing the multiple-state memory.

Entanglement dynamics of two distant atoms in two detuning cavities * Ji Xin(计 新) a)b) † , Lü Tian-Quan(吕天全) a) , and Zhang Shou(张 寿) a)b) ‡ a) Center for the Condensed-