Super-Poissonian intensity fluctuations and correlations between pump and probe fields in Electromagnetically Induced Transparency

We have measured the intensity fluctuations of pump and probe beams after interaction with Rb atoms in a situation of Electromagnetically Induced Transparency. Both fields present super-Poissonian statistics and their intensities become correlated, in good qualitative agreement with theoretical predictions in which both fields are treated quantum-mechanically. The intensity correlations measured are a first step towards the observation of entanglement between the fields.