title: Josephson effect for photons in two weakly linked microcavities.
abstract: We describe an optical system that allows for direct observation of the photonic Josephson effects in two weakly linked microcavities containing ultracold two-level atoms. We show that, by moving the ultracold atoms within one cavity, we could simulate an analogous superconducting circuit and realize both the alternating- and direct-current (ac and dc) photonic Josephson effects. This provides a strategy for constructing novel interference devices of coherent photons and enables new investigations of the effect of many-body physics in strongly coupled atom-cavity systems.
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: An-Chun
authors.initials: AC
authors.lastname: Ji
authors.forename: Qing
authors.initials: Q
authors.lastname: Sun
authors.forename: X C
authors.initials: XC
authors.lastname: Xie
authors.forename: W M
authors.initials: WM
authors.lastname: Liu