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DPG

Berlin 2012 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 8: Transport: Quantum Coherence and Quantum Information Systems 1 (jointly with TT, MA)

HL 8.2: Vortrag

Montag, 26. März 2012, 09:45–10:00, BH 243

Single atom lasing of a dressed flux qubit — •Gregor Oelsner1, Pascal Macha1, Miroslav Grajcar2, Oleg Astafiev3, Boris Ivanov1, Evgeni Il'ichev1, Uwe Hübner1, Solveig Anders1, and Hans-Georg Meyer11Institute of Photonic Technology, PO Box 100239, D-07702 Jena, Germany — 2Department of Solid State Physics, Comenius University, SK-84248 Bratislava, Slovakia — 3NEC Nano Electronics Research Laboratories. Tsukuba, Ibaraki, 305-8501, Japan

We study a strongly driven superconducting flux qubit coupled to a high-quality coplanar waveguide resonator. In the frame of the dressed state approach, the energy of the Rabi splitting depends on the amplitude of the microwave field and the detuning between the qubit and the microwave frequency, which also controls the level occupation. If, for a certain detuning and amplitude, this splitting is in resonance with the fundamental mode of the resonator, a lasing (damping) effect is expected. Indeed we experimentally observe an increase in the transmission amplitude as well as line width narrowing, which proofs the predicted phenomena.

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