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Proceedings Paper

Single-photon frequency conversion for quantum interface
Author(s): Yuanhua Li; Tong Xiang; Yuanlin Zheng; Xianfeng Chen
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Paper Abstract

Single-photon frequency conversion for quantum interface plays an important role in quantum communications and networks, which is crucial for the realization of quantum memory, faithful entanglement swapping and quantum teleportation. In this talk, I will present our recent experiments about single-photon frequency conversion based on quadratic nonlinear processes. Firstly, we demonstrated spectrum compression of broadband single photons at the telecom wavelength to the near-visible window. A positively chirped single-photon-level laser pulse and a negatively chirped classical one are converted to a narrowband single-photon pulse, with a spectrum compression factor of 58, through sum-frequency generation (SFG), marking a critical step towards coherent photonic interface. Secondly, we demonstrated the nonlinear interaction between two chirped broadband single-photon-level coherent states. A high SFG efficiency of 1.06 × 10−7 is realized, which may be utilized to achieve heralding entanglement at a distance. Finally, we theoretically introduced and experimentally demonstrated single-photon frequency conversion in the telecom band, enabling switching of single photons between dense wavelength-division multiplexing channels. Using cascaded quasi-phase matched sum/difference frequency generation, the signal photon of a photon pair from spontaneous down-conversion is precisely shifted to identically match its counterpart, i.e. idler photon, in frequency to manifest a clear non-classical dip in the Hong-Ou-Mandel interference. Moreover, quantum entanglement between the photon pair is maintained after the frequency conversion. Our researches have realized three significant quantum interfaces via single-photon frequency conversion, which hold great promise for the development of quantum communications and networks.

Paper Details

Date Published: 14 November 2018
PDF: 8 pages
Proc. SPIE 10825, Quantum and Nonlinear Optics V, 108250T (14 November 2018); doi: 10.1117/12.2500407
Show Author Affiliations
Yuanhua Li, Shanghai Jiao Tong Univ. (China)
Tong Xiang, Shanghai Jiao Tong Univ. (China)
Yuanlin Zheng, Shanghai Jiao Tong Univ. (China)
Xianfeng Chen, Shanghai Jiao Tong Univ. (China)

Published in SPIE Proceedings Vol. 10825:
Quantum and Nonlinear Optics V
Qihuang Gong; Guang-Can Guo; Byoung S. Ham, Editor(s)

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