Dressed-State Amplification by a Single Superconducting Qubit

G. Oelsner, P. MacHa, O. V. Astafiev, E. Il'Ichev, M. Grajcar, U. Hübner, B. I. Ivanov, P. Neilinger, H. G. Meyer

Research output: Contribution to journalArticlepeer-review

46 Citations (Scopus)


We demonstrate amplification of a microwave signal by a strongly driven two-level system in a coplanar waveguide resonator. The effect, similar to the dressed-state lasing known from quantum optics, is observed with a single quantum system formed by a persistent current (flux) qubit. The transmission through the resonator is enhanced when the Rabi frequency of the driven qubit is tuned into resonance with one of the resonator modes. Amplification as well as linewidth narrowing of a weak probe signal has been observed. The stimulated emission in the resonator has been studied by measuring the emission spectrum. We analyzed our system and found an excellent agreement between the experimental results and the theoretical predictions obtained in the dressed-state model.

Original languageEnglish
Article number053602
JournalPhysical Review Letters
Issue number5
Publication statusPublished - 30 Jan 2013
Externally publishedYes


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