Observation of frequency-uncorrelated photon pairs generated by counter-propagating spontaneous parametric down-conversion
| Autor: | Zhenda Xie, Yi-Chen Liu, Chang-Wei Sun, Xinhui Li, Dong-Jie Guo, Ran Yang, Wei Zhou, Kun-Qian Ren, Minghao Shang, Ping Xu, Shining Zhu, Yan-Xiao Gong |
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| Rok vydání: | 2021 |
| Předmět: |
Quantum optics
Physics Waveguide (electromagnetism) Multidisciplinary Photon business.industry Science Bandwidth (signal processing) Physics::Optics 01 natural sciences Article 010309 optics Wavelength Optics Spontaneous parametric down-conversion 0103 physical sciences Medicine Photonics Single photons and quantum effects 010306 general physics business Radiant intensity |
| Zdroj: | Scientific Reports Scientific Reports, Vol 11, Iss 1, Pp 1-6 (2021) |
| ISSN: | 2045-2322 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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