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Abstract: Solid-state superconducting circuits are versatile systems in which quantumstates can be engineered and controlled. Recent progress in this area hasopened up exciting possibilities for exploring fundamental physics as well asapplications in quantum information technology; in a series of experiments itwas shown that such circuits can be exploited to generate quantum opticalphenomena, by designing superconducting elements as artificial atoms that arecoupled coherently to the photon field of a resonator. Here we demonstrate alasing effect with a single artificial atom - a Josephson-junction charge qubit- embedded in a superconducting resonator. We make use of one of the propertiesof solid-state artificial atoms, namely that they are strongly and controllablycoupled to the resonator modes. The device is essentially different fromexisting lasers and masers; one and the same artificial atom excited by currentinjection produces many photons.

Author: O. Astafiev, K. Inomata, A. O. Niskanen, T. Yamamoto, Yu. A. Pashkin, Y. Nakamura, J. S. Tsai


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