Emission Spectrum of a Qubit under Its Deep Strong Driving in the High-Frequency Dispersive Regime

Abstract

We study the emission spectrum of a qubit under deep strong driving in the high-frequency dispersive regime when the driving frequency and strength exceed significantly the qubit transition frequency. Closed-form expressions for the steady-state first-order field correlation function and the multiphoton emission spectrum are obtained. The spectrum comprises a series of narrow delta-like lines that stem from coherent processes and Lorenzian peaks that result from the incoherent scattering of photons. The oscillating dependence of the widths of the emission lines on the driving strength is predicted. We show how the features of this dependence are governed by the qubit dephasing and relaxation rates.

Controllable sidebands of resonance fluorescence of a two-level system driven by bichromatic field

“…Resonance fluorescence, radiating from quantum emitters driven by external fields, has been extensively studied theoretically and experimentally. For instance, this phenomenon has been studied in various emitters ranging from two-level atom [1][2][3] to multilevel ones [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] subjected to a variety of external fields ranging from monochromatic excitation fields to bi-and poly-chromatic ones [19][20][21][22][23][24][25][26][27]. Apart from different types of emitters and external fields, the investigations have also considered the influence of various environments with which the emitters interact on the resonance fluorescence,e.g.…”