Berlin 2008 – scientific programme

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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 Shnirman^1,2 — 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