Crossover from weak to strong coupling regime in dispersive circuit QED

Details Crossover from weak to strong coupling regime in dispersive circuit QED Crossover from weak to strong coupling regime in dispersive circuit QED

2006-06-28

arxiv.org/abs/cond-mat/0606734v5

Europhys. Lett., 80 (2007) 40011

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Published version

Scientific paper

10.1209/0295-5075/80/40011

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 a strong coupling regime, with qualitatively different behavior of the dephasing rate. We identify and give a physicaly intuitive discussion of both decoherence mechanisms. 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.

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