Author:
Liu Yi-Chen,Guo Dong-Jie,Ren Kun-Qian,Yang Ran,Shang Minghao,Zhou Wei,Li Xinhui,Sun Chang-Wei,Xu Ping,Xie Zhenda,Gong Yan-Xiao,Zhu Shi-Ning
Abstract
AbstractWe report the generation of frequency-uncorrelated photon pairs from counter-propagating spontaneous parametric down-conversion in a periodically-poled KTP waveguide. The joint spectral intensity of photon pairs is characterized by measuring the corresponding stimulated process, namely, the difference frequency generation process. The experimental result shows a clear uncorrelated joint spectrum, where the backward-propagating photon has a narrow bandwidth of 7.46 GHz and the forward-propagating one has a bandwidth of 0.23 THz like the pump light. The heralded single-photon purity estimated through Schmidt decomposition is as high as 0.996, showing a perspective for ultra-purity and narrow-band single-photon generation. Such unique feature results from the backward-wave quasi-phase-matching condition and does not has a strict limitation on the material and working wavelength, thus fascinating its application in photonic quantum technologies.
Funder
National Key R&D Program of China
Key R&D Program of Guangdong Province
Leading-edge technology Program of Jiangsu Natural Science Foundation
National Natural Science Foundation of China
Publisher
Springer Science and Business Media LLC
Cited by
17 articles.
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