Coherence times of dressed states of a superconducting qubit under extreme driving

Details Coherence times of dressed states of a superconducting qubit under extreme driving Coherence times of dressed states of a superconducting qubit under extreme driving

2007-03-23

arxiv.org/abs/cond-mat/0703629v1

Physical Review Letters 98, 257003 (2007)

Physics

Condensed Matter

Superconductivity

5 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.98.257003

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 theory. In addition, we extract the relaxation and dephasing rates of these states.

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