Observation of ground-state quantum beats in atomic spontaneous emission
classification
🪐 quant-ph
physics.atom-ph
keywords
beatsquantumatomicemissionground-statespontaneousautocorrelationcoherence
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We report ground-state quantum beats in spontaneous emission from a continuously driven atomic ensemble. Beats are visible only in an intensity autocorrelation and evidence spontaneously generated coherence in radiative decay. Our measurement realizes a quantum eraser where a first photon detection prepares a superposition and a second erases the "which-path" information in the intermediate state.
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