Abstract
The laser-excited resonance fluorescence of a single atomic particle is interrupted for macroscopic time intervals, while the particle, after having undergone a quantum jump,1 resides in a metastable (or OFF) state. Therefore, these dark intervals serve as the signature of quantum jumps to the OFF state and back to the ON state. For a Ba+ ion interacting with laser light at 493 and 650 nm,2,3 the ON state is a superimposition of the 2S1/2, 2Р1/2, and 2D3/2 levels.
© 1987 Optical Society of America
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