2014/02/03 by Carlos Navarrete-Benlloch, Juan José García-Ripoll, Diego Porras
Physics and Astronomy · #quant-ph
paper · pdf · doi:10.1103/physrevlett.113.193601
published as Phys. Rev. Lett. 113, 193601 (2014) · Comments and suggestions are welcome
arxiv created 2014/02/03 · arxiv updated 2014/11/11
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 non-classical 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 many-body phase transitions.