Almost regular weekly seminar.

[PHOTO] 07/04 11:00
Pavol Neilinger (Bratislava)
Landau-Zener-Stückelberg-Majorana interference and Rabi-like oscillations in circuit QED
A linear sweep of a quantum two-level system through its avoided energy level crossing leads to non-adiabatic transition at the avoided crossing. This transition from ground to excited state is known as the Landau-Zener tunneling. A periodical sweeping of the qubit state through the avoided level crossing induces subsequent Landau−Zener transitions leading to Landau-Zener-Stückelberg-Majorana (LZSM) interference. We report on experimental observation of LZSM interference patterns through the amplification/attenuation of a probe signal in a driven two-level quantum system, coupled to a microwave resonator under an external off-resonant drive. The experimental data are explained by the interaction of the probe signal with Rabi-like oscillations, a reminiscent of the oscillations of level occupation in resonantly driven two-level quantum systems, the well-known Rabi oscillations. The Rabi-like oscillations are created by constructive interference of LZSM transitions during the driving period of the qubit. Furthermore, a numerical computation of the average photon number in the resonator is carried out on a driven two-level system strongly coupled to a single-mode radiation field of a quantized resonator, creating a multi-level qubit-resonator system. The obtained LZSM interference patterns in the average photon number are compared with the analytical approach of the Rabi-like oscillations and good correspondence is found. Thus, we propose, similarly to the use of Rabi oscillations, to exploit the Rabi-like oscillations for the processing of microwave quantum signals.
Place: RCQI, Institute of Physics, Dúbravská cesta 9, Bratislava | map |

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