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- Title
Observation of frequency-uncorrelated photon pairs generated by counter-propagating spontaneous parametric down-conversion.
- Authors
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
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.
- Subjects
PHOTONS; WAVEGUIDES; BANDWIDTHS; CHEMICAL decomposition; BACKWARD-wave tubes
- Publication
Scientific Reports, 2021, Vol 11, Issue 1, p1
- ISSN
2045-2322
- Publication type
Article
- DOI
10.1038/s41598-021-92141-y