  The broadband parametric fluorescence pulse (probe light) with center
frequency resonant on 87Rb D1 line was injected into a cold atomic ensemble
with coherent light (control light). Due to the low gain in the parametric down
conversion process, the probe light was in a highly bunched photon-pair state.
By switching off the control light, the probe light within the
electromagnetically induced transparency window was mapped on the atoms. When
the control light was switched on, the probe light was retrieved and frequency
filtered storage was confirmed from the superbunching effect and an increase of
the coherence time of the retrieved light.

Quantum Physics