SKM 2021 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 5: Poster Session: Superconductivity

TT 5.27: Poster

Montag, 27. September 2021, 13:30–16:00, P

Transmission spectra of the driven, dissipative Rabi model in the USC regime — •Luca Magazzu¹, Pol Forn-Diaz^2,3,4, and Milena Grifoni¹ — ¹Institute for Theoretical Physics, University of Regensburg, 93040 Regensburg, Germany — ²Institut de Física d’Altes Energies (IFAE) — ³The Barcelona Institute of Science and Technology (BIST), Bellaterra (Barcelona) 08193, Spain — ⁴Qilimanjaro Quantum Tech SL, Barcelona, Spain

We present theoretical transmission spectra of a strongly driven, damped, flux qubit coupled to a dissipative resonator in the ultrastrong coupling regime. Such a qubit-oscillator system, described within a dissipative Rabi model, constitutes the building block of super-conducting circuit QED platforms. The addition of a strong drive allows one to characterize the system properties and study novel phenomena, leading to a better understanding and control of the qubit-oscillator system. The calculated transmission of a weak probe field quantifies the response of the qubit, in frequency domain, under the influence of the quantized resonator and of the strong microwave drive. We find distinctive features of the entangled driven qubit-resonator spectrum, namely resonant features and avoided crossings, modified by the presence of the dissipative environment. The magnitude, positions, and broadening of these features are determined by the interplay among qubit-oscillator detuning, the strength of their coupling, the driving amplitude, and the interaction with the heat bath. This work establishes the theoretical basis for future experiments in the driven ultrastrong coupling regime.
[1] arXiv:2104.14490 (2021)