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arXiv · 2002.07165

Bloch-Siegert oscillations in the Rabi model with an amplitude-modulated driving field

A. P. Saiko·S. A. Markevich·R. Fedaruk
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Abstract

We study the coherent dynamics of a qubit excited by an amplitude-modulated electromagnetic field under the Rabi resonance when the frequency of the low-frequency modulation field matches the Rabi frequency in the high-frequency field. Due to destructive interference of multiple photon processes at the ultrastrong coupling between the qubit and the low-frequency driving field, Rabi oscillations result exclusively from the Bloch-Siegert effect. It is directly observed in the time-resolved coherent dynamics as the Bloch-Siegert oscillation. In this case, triplets in Fourier spectra of the coherent response are transformed into doublets with the splitting between the lines equal to twice the Bloch-Siegert shift. These unusual properties are demonstrated in conditions of experiments with a nitrogen vacancy center in diamond.

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A. P. Saiko, S. A. Markevich, R. Fedaruk. 2020-02-17. Bloch-Siegert oscillations in the Rabi model with an amplitude-modulated driving field. https://doi.org/10.1088/1555-6611%2Fab4bc6

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