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Dressed-State Amplification by a Single Superconducting Qubit

Dressed-State Amplification by a Single Superconducting Qubit

We demonstrate amplification of a microwave signal by a strongly driven two-level system in a coplanar waveguide resonator. The effect known from optics as dressed-state lasing is observed with a single quantum system formed by a persistent current (flux) qubit. The transmission through the resonator is enhanced when the Rabi …