title: Inducing nonclassical lasing via periodic drivings in circuit quantum electrodynamics.
abstract: We show how a pair of superconducting qubits coupled to a microwave cavity mode can be used to engineer a single-atom laser that emits light into a nonclassical state. Our scheme relies on the dressing of the qubit-field coupling by periodic modulations of the qubit energy. In the dressed basis, the radiative decay of the first qubit becomes an effective incoherent pumping mechanism that injects energy into the system, hence turning dissipation to our advantage. A second, auxiliary qubit is used to shape the decay within the cavity, in such a way that lasing occurs in a squeezed basis of the cavity mode. We characterize the system both by mean-field theory and exact calculations. Our work may find applications in the generation of squeezing and entanglement in circuit QED, as well as in the study of dissipative few- and many-body phase transitions.
authors.affiliation: Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-strasse 1, 85748 Garching, Germany.
authors.forename: Carlos
authors.initials: C
authors.lastname: Navarrete-Benlloch
authors.affiliation: Instituto de Física Fundamental, IFF-CSIC, Serrano 113-bis, Madrid E-28006, Spain.
authors.forename: Juan José
authors.initials: JJ
authors.lastname: García-Ripoll
authors.affiliation: Department of Physics and Astronomy, University of Sussex, Falmer, Brighton BN19QH, United Kingdom and Departamento de Física Teórica I, Universidad Complutense, 28040 Madrid, Spain.
authors.forename: Diego
authors.initials: D
authors.lastname: Porras