title: Delocalized single-photon Dicke states and the Leggett-Garg inequality in solid state systems.
abstract: We show how to realize a single-photon Dicke state in a large one-dimensional array of two-level systems, and discuss how to test its quantum properties. The realization of single-photon Dicke states relies on the cooperative nature of the interaction between a field reservoir and an array of two-level-emitters. The resulting dynamics of the delocalized state can display Rabi-like oscillations when the number of two-level emitters exceeds several hundred. In this case, the large array of emitters is essentially behaving like a "mirror-less cavity". We outline how this might be realized using a multiple-quantum-well structure or a dc-SQUID array coupled to a transmission line, and discuss how the quantum nature of these oscillations could be tested with an extension of the Leggett-Garg inequality.
authors.affiliation: Department of Physics and National Center for Theoretical Sciences, National Cheng-Kung University, Tainan 701, Taiwan.
authors.forename: Guang-Yin
authors.initials: GY
authors.lastname: Chen
authors.forename: Neill
authors.initials: N
authors.lastname: Lambert
authors.forename: Che-Ming
authors.initials: CM
authors.lastname: Li
authors.forename: Yueh-Nan
authors.initials: YN
authors.lastname: Chen
authors.forename: Franco
authors.initials: F
authors.lastname: Nori