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. 2021 Feb 17;7(8):eabe0719. doi: 10.1126/sciadv.abe0719

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Copyright © 2021 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).

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Fig. 2 — (A) Floquet states of a periodically driven two-level system (Floquet system). The energy gap between the upper and lower Floquet states ∣ + ⟩_n and ∣ − ⟩_m is E_n,m/2π = (n − m)ν_ac + ν₀. The spin population P_z and the feedback gain χ are set as P_z > 0, χ > 0 or P_z < 0, χ < 0. (B) Signal of ¹²⁹Xe Floquet maser. The insets are zoom-in plots for the signal and the simulated spin population (P_z). (C and D) The corresponding amplitude spectra of the maser signal after eliminating the transient [ν_ac = 0 for (C); 0.9 Hz for (D)].