Berlin 2008 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 27: Symposium: Circuit QED

TT 27.2: Hauptvortrag

Donnerstag, 28. Februar 2008, 10:00–10:30, H 0104

Sisyphus cooling and amplification by a superconducting qubit — •Evgeni Il’ichev¹, M. Grajcar^1,2, S.H.W. van der Ploeg¹, A. Izmalkov¹, H.-G. Meyer¹, A. Fedorov³, A. Shnirman⁴, and Gerd Schoen⁵ — ¹Institute of Photonic Technology, Albert-Einsteinstr 9, 07745, Jena, Germany — ²Department of Experimental Physics, Comenius University, SK-84248 Bratislava, Slovakia — ³Quantum Transport Group, Delft University of Technology, 2628CJ Delft, The Netherlands — ⁴Institut für Theoretische Physik, Universität Innsbruck, Austria — ⁵Institut für Theoretische Festkörperphysik and DFG-Center for Functional Nanostructures (CFN), Universität Karlsruhe, Germany

Recently superconducting qubits have been shown to act as artificial two-level atoms, demonstrating many different quantum effects known in quantum optics. Coupling such qubits to resonators is quite natural extension of this analogy. Similar to laser cooling of the atomic motion we demonstrate here Sisyphus cooling of a low frequency LC oscillator coupled to a near-resonantly driven flux qubit. The analogy to the quantum optics is obvious: the LC oscillator plays the role of the mechanical degree of freedom of an atom, while the qubit mimics the electronic, laser driven, transition. We also demonstrate the counterpart of the Sisyphus cooling, namely, Sisyphus amplification.