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TT: Fachverband Tiefe Temperaturen

TT 5: Transport: Quantum Coherence and Quantum Information Systems 1 (jointly with MA and HL)

TT 5.2: 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 Meyer¹ — ¹Institute 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.