Experimental Generation of Narrow-Band Paired Photons: from Damped Rabi Oscillation to Group Delay

Kai-Yu Liao, Hui Yan, Jun-Yu He, Wei Huang, Zhi-Ming Zhang, Shi-Liang Zhu
2014 Chinese Physics Letters  
We report the experimental generation of narrow-band paired photons through electromagnetically induced transparency and spontaneous four-wave mixing in a two-dimensional magneto-optical trap (2D MOT). By controlling the optical depth of the 2D MOT from 0 to 40, the temporal length of the generated narrow-band paired photons can be varied from 50 to 900 ns. The 'transition' between damped Rabi oscillation and group delay is observed undisputedly. In the damped Rabi oscillation regime, a
more » ... n regime, a violation factor of the Cauchy-Schwartz inequality as large as 6642 is observed. In the group delay regime, sub-MHz linewidth (∼ 0.65 MHz) paired photons are obtained with a generation rate of about 0.8 × 10 5 s −1 .
doi:10.1088/0256-307x/31/3/034205 fatcat:x44wenspnbcbdhiz7rej44nhea