Journal
PHYSICAL REVIEW LETTERS
Volume 110, Issue 5, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.110.053602
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Funding
- European Community's Seventh Framework Programme [270843]
- EU
- Slovak Research and Development Agency [APVV-0432-07, APVV-0515-10, LPP-0159-09]
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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. DOI: 10.1103/PhysRevLett.110.053602
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