We demonstrate channel-selective frequency up-conversion from telecom wavelengths around 1540 nm for optical fiber communication to visible wavelengths around 780 nm, based on second-order optical nonlinearity in a cavity of the converted modes. In our experiment, we selectively convert a light from any frequency mode within frequency-multiplexed telecom signals to a desired output mode, determined by the cavity resonances. Based on the experimental results of the frequency up-conversion, we derive the signal-to-noise ratio of the process at the single-photon level, and discuss its applicability to channel-selective quantum frequency conversion (CS-QFC) in the context of frequency-multiplexed quantum networks. Finally, we describe specific use cases of the CS-QFC, which show its utility as a reconfigurable switching element in frequency-multiplexed networks, particularly for selectively performing Bell-state measurements between two photons originating from different frequencies.
@article{arxiv.2511.16085,
title = {Channel-selective frequency up-conversion for frequency-multiplexed quantum network},
author = {Shoichi Murakami and Shunsuke Hiraoka and Toshiki Kobayashi and Takashi Yamamoto and Rikizo Ikuta},
journal= {arXiv preprint arXiv:2511.16085},
year = {2026}
}