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TT: Fachverband Tiefe Temperaturen
TT 27: Symposium: Circuit QED
TT 27.7: Talk
Thursday, February 28, 2008, 12:15–12:30, H 0104
Dissipation in circuit QED — •Stephan André1, Valentina Brosco1, Gerd Schön1, and Alexander Shnirman1,2 — 1Institut für Theoretische Festkörperphysik and DFG-Center for Functional Nanostructures (CFN), Universität Karlsruhe, Germany — 2Institut für Theoretische Physik, Innsbruck, Austria
Recently many experimental and theoretical works realized concepts originally introduced in the field of quantum optics [1,2]. In the present work, we study the dynamics of a flux qubit coupled to a slow LC-oscillator in presence of noise. The qubit is driven to perform Rabi oscillations, and the Rabi frequency is tuned to resonance with the oscillator. When the qubit driving frequency is blue-detuned, the system exhibits lasing behaviour; for red detuning, the qubit cools the oscillator. We analyze the effects of different types of environment on the dynamics of this system. We show that there is a remarkable dependence of the lasing and cooling on the noise spectrum acting on the qubit.
[1] E. Il’ichev et al., Phys. Rev. Lett. 91,097906 (2003).
[2] J.Hauss et al. cond-mat/0701041