Abstract
The laser-excited resonance fluorescence of a single Ba + ion at 493 nm shows interruptions of macroscopic time durations when the ion drops into a dark state by off-resonant Raman scattering, or by weak excitation of the 2P 3/2 level. We manipulate the ion out of the state by auxiliary laser light and prove that state to be the metastable 2D 5/2 level. Fluorescence from three ions displays an enhanced rate of multiple “jumps” which reveals cooperative ionic interaction with the light.
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