Abstract
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.
- Received 4 February 2010
DOI:https://doi.org/10.1103/PhysRevLett.105.123602
© 2010 The American Physical Society