Vacuum-Field Rabi Splittings in Microwave Absorption by Rydberg Atoms in a Cavity
G. S. Agarwal · Physical Review Letters · 1984
The absorption spectrum of a system of $N$ atoms interacting with a single mode of the quantized radiation field is exactly calculated. Such a spectrum shows vacuum-field Rabi splittings, and thus microwave absorption by Rydberg atoms in a cavity should be a useful way to observe these splittings.