We study the asymptotic dynamics of a driven quantum two level system coupled via a quantum detector to the environment. We find multi-photon resonances which are due to the entanglement of the qubit and the detector. Different regimes are studied by employing a perturbative Floquet-Born-Markov approach for the qubit+detector system, as well as non-perturbative real-time path integral schemes for the driven spin-boson system. We find analytical results for the resonances, including the red and the blue sidebands. They agree well with those of exact ab-initio calculations.
@article{arxiv.cond-mat/0405220,
title = {Entanglement spectroscopy of a driven solid-state qubit and its detector},
author = {M. C. Goorden and M. Thorwart and M. Grifoni},
journal= {arXiv preprint arXiv:cond-mat/0405220},
year = {2009}
}