One- and two-photon spectroscopy of a flux qubit coupled to a microscopic defect

Details One- and two-photon spectroscopy of a flux qubit coupled to a microscopic defect One- and two-photon spectroscopy of a flux qubit coupled to a microscopic defect

2008-10-03

arxiv.org/abs/0810.0590v2

Physical Review B 80, 172506 (2009)

Physics

Condensed Matter

Superconductivity

accepted in Physical Review B

Scientific paper

10.1103/PhysRevB.80.172506

We observed the dynamics of a superconducting flux qubit coupled to an extrinsic quantum system (EQS). The presence of the EQS is revealed by an anticrossing in the spectroscopy of the qubit. The excitation of a two-photon transition to the third excited state of the qubit-EQS system allows us to extract detailed information about the energy level structure and the coupling of the EQS. We deduce that the EQS is a two-level system, with a transverse coupling to the qubit. The transition frequency and the coupling of the EQS changed during experiments, which supports the idea that the EQS is a two-level system of microscopic origin.

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