We present an analytical and comprehensive description of the quantum dynamics of a microwave resonantly driven superconducting phase qubit coupled to a microscopic two-level system (TLS), covering a wide range of the external microwave field strength. Our model predicts several interesting phenomena in such an ac driven four-level bipartite system including anomalous Rabi oscillations, high-contrast beatings of Rabi oscillations, and extraordinary two-photon transitions. Our experimental results in a coupled qubit-TLS system agree quantitatively very well with the predictions of the theoretical model.
@article{arxiv.1004.4664,
title = {Quantum Dynamics of a Microwave Driven Superconducting Phase Qubit Coupled to a Two-Level System},
author = {Guozhu Sun and Xueda Wen and Bo Mao and Zhongyuan Zhou and Yang Yu and Peiheng Wu and Siyuan Han},
journal= {arXiv preprint arXiv:1004.4664},
year = {2010}
}