Experiments in waveguide QED in an optical nanofiber

Optical nanofibers with atoms trapped on the evanescent field are an ideal platform to explore waveguide QED. We are now studying the response of the system (trapped Cs atoms) to two photon excitation (883 nm). It is possible to reach the 6D_5/2 state with which the decays into an empty 6P_3/2 state generating (917 nm) super-radiant pulses that subsequently decay into the 6S_1/2 ground state (852). Our exploration includes the dynamics and correlations between the 917 and 852 light in opposite directions.