Inducing Non-Classical Lasing Via Periodic Drivings in Circuit Quantum Electrodynamics

Understand

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.