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Qubit-oscillator system: An analytical treatment of the ultrastrong coupling regime

URN to cite this document:
Hausinger, Johannes ; Grifoni, Milena
Date of publication of this fulltext: 23 Dec 2010 07:27


We examine a two-level system coupled to a quantum oscillator, typically representing experiments in cavity and circuit quantum electrodynamics. We show how such a system can be treated analytically in the ultrastrong coupling limit, where the ratio g/Ω between coupling strength and oscillator frequency approaches unity and goes beyond. In this regime the Jaynes-Cummings model is known to fail ...


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