Spectral linewidth narrowing in a strongly coupled atom-cavity system via squeezed-light excitation of a ‘‘vacuum’’ Rabi resonance

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Abstract
The system consisting of a two-level atom coupled strongly to a cavity mode behaves as a two-state system when excited near one of the ‘‘vacuum’’ Rabi resonances. With finite-bandwidth squeezed light incident upon the cavity and tuned to one of these resonances, we show that it is possible to realize a two-state system coupled to a squeezed vacuum. This system exhibits subnatural linewidths in the emitted spectra, as described by Gardiner [Phys. Rev. Lett. 56, 1917 (1986)] in a study of spontaneous emission of a two-level atom in a squeezed vacuum, but requires that only a single cavity mode be subject to squeezing rather than the entire three-dimensional vacuum.