2016/02/29 by Zhen Chen, Yimin Wang, Tiefu Li +8 · 1 citation
Physics and Astronomy · #quant-ph #cond-mat.supr-con
paper · pdf · doi:10.1103/physreva.96.012325
published as Phys. Rev. A 96, 012325 (2017) · Accepted in Physical Review A. 12 pages, 6 figures
arxiv created 2017/06/27 · arxiv updated 2017/07/21
We report the experimental observation of high-order sideband transitions at the single-photon level in a quantum circuit system of a flux qubit ultrastrongly coupled to a coplanar waveguide resonator. With the coupling strength reaching 10% of the resonator's fundamental frequency, we obtain clear signatures of higher-order red and first-order blue-sideband transitions, which are mainly due to the ultrastrong Rabi coupling. Our observation advances the understanding of ultrastrongly-coupled systems and paves the way to study high-order processes in the quantum Rabi model at the single-photon level.