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TT: Fachverband Tiefe Temperaturen

TT 3: Quantum Coherence and Quantum Information Systems I

TT 3.9: Talk

Monday, March 26, 2007, 12:00–12:15, H20

Phase Purcell effect and the crossover to strong coupling in dispersive circuit QED — •Ioana Serban^1,2, Frank Wilhelm², and Enrique Solano¹ — ¹Ludwig-Maximilians-Universitaet, Munich, Germany — ²Institute for Quantum Computing, Waterloo, Canada

We study the decoherence of a superconducting qubit due to the dispersive coupling to a damped harmonic oscillator. We go beyond the weak qubit-oscillator coupling, which we associate with a phase Purcell effect, and enter into an unexplored decoherence regime, solving a theoretical inconsistency in existing models: the divergence of the qubit dephasing rate in the absence of environment. Our results can be applied, with small adaptations, to a large variety of other physical systems, e.g. trapped ions and cavity QED, boosting theoretical and experimental decoherence studies.