Temporal- and spectral-property measurements of narrowband photon pairs from warm double-Λ-type atomic ensemble

Abstract

We investigate the temporal and spectral properties of narrowband photon pairs from a double-Λ-type atomic system of a warm 87 Rb atomic ensemble. The temporal properties of the narrowband photons are investigated by measuring their auto-correlation and cross-correlation functions. The spectral measurement of the photon pair is obtained by applying the stimulated emission method. We show that the biphoton spectral waveform with a spectral width of ∼6 MHz corresponds to the biphoton temporal waveform with a temporal width of ∼26 ns. We believe that our results can contribute to the characterization of narrowband photons generated from atomic ensembles and aid in the development of new photonic quantum states generated from atomic systems.