Photonics Research, 2017, 5 (4): 04000324, Published Online: Oct. 10, 2018
Nonlinear interaction between broadband single-photon-level coherent states Download: 601次
Abstract
We experimentally demonstrate the nonlinear interaction between two chirped broadband single-photon-level coherent states. Each chirped coherent state is generated in independent fiber Bragg gratings. They are simultaneously coupled into a high-efficiency nonlinear waveguide, where they are converted into a narrowband single-photon state with a new frequency by the process of sum-frequency generation (SFG). A higher SFG efficiency of 1.06 × 10 7 is realized, and this efficiency may achieve heralding entanglement at a distance. This also made it possible to realize long-distance quantum communication, such as device-independent quantum key distribution, by directly using broadband single photons without filtering.
Yuanhua Li, Tong Xiang, Yiyou Nie, Minghuang Sang, Xianfeng Chen. Nonlinear interaction between broadband single-photon-level coherent states[J]. Photonics Research, 2017, 5(4): 04000324.