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

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

2007-06-27

arxiv.org/abs/0706.4029v1

New Journ. Phys., 9, 316 (2007)

Physics

Condensed Matter

Statistical Mechanics

17 pages, 6 figures

Scientific paper

10.1088/1367-2630/9/9/316

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.

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