Coherence Times of Dressed States of a Superconducting Qubit under Extreme Driving

C. M. Wilson, T. Duty, F. Persson, M. Sandberg, G. Johansson, P. Delsing
2007 Physical Review Letters  
In this work, we measure longitudinal dressed states of a superconducting qubit, the single Cooper-pair box, and an intense microwave field. The dressed states represent the hybridization of the qubit and photon degrees of freedom, and appear as avoided level crossings in the combined energy diagram. By embedding the circuit in an rf oscillator, we directly probe the dressed states. We measure their dressed gap as a function of photon number and microwave amplitude, finding good agreement with
more » ... ood agreement with theory. In addition, we extract the relaxation and dephasing rates of these states.
doi:10.1103/physrevlett.98.257003 pmid:17678048 fatcat:rmhlfcyhevfz3kjvcwjjvppvq4