Dynamics of a qubit coupled to a broadened harmonic mode at finite detuning

Abstract

We study the dynamics of a symmetric two-level system strongly coupled to a broadened harmonic mode. Upon mapping the problem onto a spin-boson model with peaked spectral density, we show how analytic solutions can be obtained, at arbitrary detuning and finite temperatures, in the case of large Q-factors of the oscillator. In general {\em two} or more oscillation frequencies of the two-level particle are observed as a consequence of the entanglement with the oscillator. Our approximated analytical solution well agrees with numerical predictions obtained within the non-interacting blip approximation.

17 pages, 6 figures

References in corpus (2)

• Resolving photon number states in a superconducting circuit
• Qubit-photon interactions in a cavity: Measurement induced dephasing and number splitting

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