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Quantum Physics

arXiv:1811.12703 (quant-ph)
[Submitted on 30 Nov 2018 (v1), last revised 11 Feb 2020 (this version, v2)]

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

Authors:G. Oelsner, U. Hübner, E. Il'ichev
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Abstract: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 frame, 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 micro fabrication of superconducting artificial quantum circuits.
Comments: 23 pages, 4 figures
Subjects: Quantum Physics (quant-ph); Superconductivity (cond-mat.supr-con)
Cite as: arXiv:1811.12703 [quant-ph]
  (or arXiv:1811.12703v2 [quant-ph] for this version)
  https://doi.org/10.48550/arXiv.1811.12703
Journal reference: Phys. Rev. B 101, 054511 (2020)
Related DOI: https://doi.org/10.1103/PhysRevB.101.054511

Submission history

From: Gregor Oelsner [view email]
[v1] Fri, 30 Nov 2018 10:33:20 UTC (1,234 KB)
[v2] Tue, 11 Feb 2020 09:44:13 UTC (441 KB)
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