In this paper we review some of our recent results on the problem of a qubit coupled to a quantum two-level system. We consider both the decoherence dynamics and the qubit's response to an oscillating external field.
@article{arxiv.cond-mat/0604475,
title = {Decoherence and Rabi oscillations in a qubit coupled to a quantum two-level system},
author = {S. Ashhab and J. R. Johansson and Franco Nori},
journal= {arXiv preprint arXiv:cond-mat/0604475},
year = {2008}
}