title: Experimental realization of a quantum phase transition of polaritonic excitations.
abstract: We report an experimental realization of the Jaynes-Cummings-Hubbard model using the internal and radial phonon states of two trapped ions. An adiabatic transfer corresponding to a quantum phase transition from a localized insulator ground state to a delocalized superfluid (SF) ground state is demonstrated. The SF phase of polaritonic excitations characteristic of the interconnected Jaynes-Cummings (JC) system is experimentally explored, where a polaritonic excitation refers to a combination of an atomic excitation and a phonon interchanged via a JC coupling.
authors.affiliation: Graduate School of Engineering Science, Osaka University, 1-3 Machikaneyama, Toyonaka, Osaka, Japan.
authors.forename: Kenji
authors.initials: K
authors.lastname: Toyoda
authors.forename: Yuta
authors.initials: Y
authors.lastname: Matsuno
authors.forename: Atsushi
authors.initials: A
authors.lastname: Noguchi
authors.forename: Shinsuke
authors.initials: S
authors.lastname: Haze
authors.forename: Shinji
authors.initials: S
authors.lastname: Urabe