Observation of frequency-uncorrelated photon pairs generated by counter-propagating spontaneous parametric down-conversion
Abstract We 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...
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Nature Portfolio
2021
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oai:doaj.org-article:0ae648c7e9954a53954ae5dcb33f69262021-12-02T16:04:14ZObservation of frequency-uncorrelated photon pairs generated by counter-propagating spontaneous parametric down-conversion10.1038/s41598-021-92141-y2045-2322https://doaj.org/article/0ae648c7e9954a53954ae5dcb33f69262021-06-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-92141-yhttps://doaj.org/toc/2045-2322Abstract We 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.Yi-Chen LiuDong-Jie GuoKun-Qian RenRan YangMinghao ShangWei ZhouXinhui LiChang-Wei SunPing XuZhenda XieYan-Xiao GongShi-Ning ZhuNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-6 (2021) |
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Medicine R Science Q Yi-Chen Liu Dong-Jie Guo Kun-Qian Ren Ran Yang Minghao Shang Wei Zhou Xinhui Li Chang-Wei Sun Ping Xu Zhenda Xie Yan-Xiao Gong Shi-Ning Zhu Observation of frequency-uncorrelated photon pairs generated by counter-propagating spontaneous parametric down-conversion |
| description |
Abstract We 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. |
| format |
article |
| author |
Yi-Chen Liu Dong-Jie Guo Kun-Qian Ren Ran Yang Minghao Shang Wei Zhou Xinhui Li Chang-Wei Sun Ping Xu Zhenda Xie Yan-Xiao Gong Shi-Ning Zhu |
| author_facet |
Yi-Chen Liu Dong-Jie Guo Kun-Qian Ren Ran Yang Minghao Shang Wei Zhou Xinhui Li Chang-Wei Sun Ping Xu Zhenda Xie Yan-Xiao Gong Shi-Ning Zhu |
| author_sort |
Yi-Chen Liu |
| title |
Observation of frequency-uncorrelated photon pairs generated by counter-propagating spontaneous parametric down-conversion |
| title_short |
Observation of frequency-uncorrelated photon pairs generated by counter-propagating spontaneous parametric down-conversion |
| title_full |
Observation of frequency-uncorrelated photon pairs generated by counter-propagating spontaneous parametric down-conversion |
| title_fullStr |
Observation of frequency-uncorrelated photon pairs generated by counter-propagating spontaneous parametric down-conversion |
| title_full_unstemmed |
Observation of frequency-uncorrelated photon pairs generated by counter-propagating spontaneous parametric down-conversion |
| title_sort |
observation of frequency-uncorrelated photon pairs generated by counter-propagating spontaneous parametric down-conversion |
| publisher |
Nature Portfolio |
| publishDate |
2021 |
| url |
https://doaj.org/article/0ae648c7e9954a53954ae5dcb33f6926 |
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