Abstract
Intermittency in the resonance fluorescence from a three-level atom has received much attention both theoretically and experimentally in recent years.1-5 Consider for example a three level atom in V configuration with a ground level coupled to two excited levels by two external coherent fields. One of these excited levels is short lived, having a lifetime in the range of nanoseconds. The transition from ground level to this excited level is strong. The other excited level acts as a metastable level with a lifetime of the order of seconds and is weakly coupled to the ground level. When the atom from the strongly fluorescing level is removed to the forbidden level, the strong fluorescence is interrupted until the atom returns to the ground level by emitting a weak transition photon. The switching on (bright interval) and off (dark interval) of the strong transition fluorescence leads to a generation of “random telegraph” signal as the atom makes random quantum jumps between the forbidden level and strongly fluorescing level.
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