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Experimental study demonstrates fractional photon emission and absorption in ultracold rubidium atoms, indicating multiphoton coupling inside a microwave cavity.
The authors demonstrate through Rydberg atom loss spectroscopy in a MOT that the well-known Autler-Townes split levels resonating in a microwave cavity can absorb and emit fractional photons to and from the cavity. A multilevel Jaynes-Cummings model provides theoretical support for near- and far-off-resonant multiphoton absorption and emission spectral features observed in the experiment.
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Kondo et al. (2024) studied this question.
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