title: Multimode circuit quantum electrodynamics with hybrid metamaterial transmission lines.
abstract: Quantum transmission lines are central to superconducting and hybrid quantum computing. In this work we show how coupling them to a left-handed transmission line allows circuit QED to reach a new regime: multimode ultrastrong coupling. Out of the many potential applications of this novel device, we discuss the preparation of multipartite entangled states and the simulation of the spin-boson model where a quantum phase transition is reached up to finite size effects.
authors.affiliation: Theoretical Physics, Universität des Saarlandes, Saarbrücken D-66123, Germany.
authors.forename: D J
authors.initials: DJ
authors.lastname: Egger
authors.forename: F K
authors.initials: FK
authors.lastname: Wilhelm