Regensburg 2007 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 28: Transport - Poster Session

TT 28.31: Poster

Thursday, March 29, 2007, 14:00–17:45, Poster A

Theoretical and experimental studies of circuit QED systems — •Matteo Mariantoni, Frank Deppe, and Rudolf Gross — Walther-Meissner-Institute, Garching, Germany

The interaction between superconducting quantum circuits and on-chip resonators has recently become an important research area, referred to as circuit QED. The formalism of circuit QED explains the coupling between a superconducting qubit (charge or flux) and a microwave resonator implemented by means of LC circuits or coplanar wave guide resonators fabricated on a chip. Instead of focusing on the well-known resonant and dispersive regimes, we investigate a deeply dispersive regime, where qubit and resonator are strongly detuned and the transition frequency of the resonator is almost negligible compared to the qubit one. This regime has been exploited experimentally in several different implementations, e.g., the reading-out of a superconducting qubit by means of a low frequency resonator. In this framework, we have developed a simple formalism which encompasses the many explanations given in the literature on the experiments mentioned above. Following these lines, we also introduce the main facts behind our experimental implementation of circuit QED, which will be presented in Part II. This work is supported by the DFG via SFB 631.