Related papers: Generation of sub-MHz and spectrally-bright biphotons from hot atomic vapors with a phase mismatch-free scheme

Generation of sub-MHz and spectrally-bright biphotons from hot atomic vapors with a phase mismatch-free scheme

URL: http://arxiv.org/abs/2012.04893v3
Date: Tue, 2 Feb 2021 16:17:01 GMT
Title: Generation of sub-MHz and spectrally-bright biphotons from hot atomic vapors with a phase mismatch-free scheme
Authors: Chia-Yu Hsu, Yu-Sheng Wang, Jia-Mou Chen, Fu-Chen Huang, Yi-Ting Ke, Emily Kay Huang, Weilun Hung, Kai-Lin Chao, Shih-Si Hsiao, Yi-Hsin Chen, Chih-Sung Chuu, Ying-Cheng Chen, Yong-Fan Chen, and Ite A. Yu
Abstract summary: We generate biphotons from a hot atomic vapor using an all-copropagating scheme. The biphoton linewidth in this work is tunable for an order of magnitude. This is the narrowest linewidth to date, among all the various kinds of single-mode biphotons.
Score: 1.8640137420505116
License: http://creativecommons.org/licenses/by/4.0/
Abstract: We utilized the all-copropagating scheme, which maintains the phase-match condition, in the spontaneous four-wave mixing (SFWM) process to generate biphotons from a hot atomic vapor. The scheme enables our biphotons not only to surpass those in the previous works of hot-atom SFWM, but also to compete with the biphotons that are generated by either the cold-atom SFWM or the cavity-assisted spontaneous parametric down conversion. The biphoton linewidth in this work is tunable for an order of magnitude. As we tuned the linewidth to 610 kHz, the maximum two-photon correlation function, $g_{s,as}^{(2)}$, of the biphotons is 42. This $g_{s,as}^{(2)}$ violates the Cauchy-Schwartz inequality for classical light by 440 folds, and demonstrates that the biphotons have a high purity. The generation rate per linewidth of the 610-kHz biphoton source is 1,500 pairs/(s$\cdot$MHz), which is the best result of all the sub-MHz biphoton sources in the literature. By increasing the pump power by 16 folds, we further enhanced the generation rate per linewidth to 2.3$\times$10$^4$ pairs/(s$\cdot$MHz), while the maximum $g_{s,as}^{(2)}$ became 6.7. In addition, we are able to tune the linewidth down to 290$\pm$20 kHz. This is the narrowest linewidth to date, among all the various kinds of single-mode biphotons.

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