Abstract
We demonstrate the generation of high-quality narrowband biphotons from a Doppler-broadened hot rubidium atomic vapor cell. Choosing a double-Λ atomic energy level scheme for optimizing both spontaneous four-wave mixing nonlinear parametric interaction and electromagnetically induced transparency (EIT), we achieve a biphoton spectral brightness as high as 14 000 s−1 MHz−1. Meanwhile, we apply a spatially tailored optical pumping beam for reduction of the Raman noise and obtain a violation of the Cauchy-Schwarz inequality by a factor of 1023.
Highlights
Bright narrowband biphoton generation from a hot rubidium atomic vapor cell Lingbang Zhu,1,a) Xianxin Guo,1,a) Chi Shu,2 Heejeong Jeong,1,3,b) and Shengwang Du1,b)
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Summary
Bright narrowband biphoton generation from a hot rubidium atomic vapor cell Lingbang Zhu,1,a) Xianxin Guo,1,a) Chi Shu,2 Heejeong Jeong,1,3,b) and Shengwang Du1,b).
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