title: Photonic analogue of Josephson effect in a dual-species optical-lattice cavity.
abstract: We extend the idea of quantum phase transitions of light in the photonic Bose-Hubbard model with interactions to two atomic species by a self-consistent mean field theory. The excitation of two-level atoms interacting with a coherent photon field is analyzed with a finite temperature dependence of the order parameters. Four ground states of the system are found, including an isolated Mott-insulator phase and three different superfluid phases. Like two weakly coupled superconductors, our proposed dual-species lattice system shows a photonic analogue of Josephson effect. i.e., the crossovers between two superfluid states. The dynamics of the proposed two species model provides a promising quantum simulator for possible quantum information processes.
authors.affiliation: Department of Physics, National Tsing-Hua University, Hsinchu 300, Taiwan.
authors.forename: Soi-Chan
authors.initials: SC
authors.lastname: Lei
authors.forename: Tai-Kai
authors.initials: TK
authors.lastname: Ng
authors.forename: Ray-Kuang
authors.initials: RK
authors.lastname: Lee