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We probe a ground-state superposition that produces a quantum beat in theintensity correlation of a two-mode cavity QED system. We mix drive withscattered light from an atomic beam traversing the cavity, and effectivelymeasure the interference between the drive and the light from the atom. When aphoton escapes the cavity, and upon detection, it triggers our feedback whichmodulates the drive at the same beat frequency but opposite phase for a giventime window. This results in a partial interruption of the beat oscillation inthe correlation function, that then returns to oscillate.

Conditional control of quantum beats in a cavity QED system