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

• URL: http://arxiv.org/abs/2002.07165v1
• Date: Mon, 17 Feb 2020 11:10:44 GMT
• Title: Bloch-Siegert oscillations in the Rabi model with an amplitude-modulated driving field
• Authors: A.P. Saiko and S.A. Markevich and R. Fedaruk
• Abstract summary: We study the coherent dynamics of a qubit excited by an amplitude-modulated electromagnetic field under the Rabi resonance. 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.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• 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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