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Single-photon driven high-order sideband transitions in an ultrastrongly coupled circuit quantum electrodynamics system
Zhen Chen, Yimin Wang, Tiefu Li, L. Tian, Y. Qiu, K. Inomata, F. Yoshihara, Siyuan Han, F. Nori, F. Nori, J. Tsai, J. Tsai, J. You·February 4, 2016·DOI: 10.1103/PhysRevA.96.012325
Physics
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Abstract
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-sideband 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.