Details

Autor(en) / Beteiligte

• Oelsner, G.
• Hübner, U.
• Il'ichev, E.

Titel

Controlling the energy gap of a tunable two-level system by ac drive

Ist Teil von

• Physical review. B, 2020-02, Vol.101 (5), p.1, Article 054511

Ort / Verlag

College Park: American Physical Society

Erscheinungsjahr

2020

Quelle

American Physical Society

Beschreibungen/Notizen

• We study the influence of a strong off-resonant driving signal to the energy levels of a superconducting flux qubit both experimentally and theoretically. In the experiment, we carry out a three-tone spectroscopy. This allows us to directly observe the modification of the qubit's energy levels by the dynamical Stark shift caused by the driving signal. A theoretical treatment including corrections from both rotating and counter-rotating frames, allowed us to completely explain the observed experimental results and to reconstruct the influence of the strong driving to the dissipative dynamics as well as to the coupling constants of the qubit. As one potential application, the tunability of the minimal energy-level splitting of a superconducting qubit by a microwave-induced dynamical Stark shift can help to overcome the parameter spread induced by the microfabrication of superconducting artificial quantum circuits.