Telecommunication wavelength with well-developed optical communication technologies and low losses in the waveguide are advantageous for quantum applications. However, an experimental generation of non-classical states called non-Gaussian states at the telecommunication wavelength is still underdeveloped. Here, we generate highly-pure-single-photon states, one of the most primitive non-Gaussian states, by using a heralding scheme with an optical parametric oscillator and a superconducting nano-strip photon detector. The Wigner negativity, the indicator of non-classicality, of the generated single photon state is −0.228±0.004, corresponded to 85.1±0.7% of single photon and the best record of the minimum value at all wavelengths. The quantum-optics-technology we establish can be easily applied to the generation of various types of quantum states, opening up the possibility of continuous-variable-quantum-information processing at telecommunication wavelengths.
@article{arxiv.2204.03736,
title = {Generation of Highly Pure Single-Photon State at Telecommunication Wavelength},
author = {Akito Kawasaki and Kan Takase and Takefumi Nomura and Sigehito Miki and Hirotaka Terai and Masahiro Yabuno and Fumihiro China and Warit Asavanant and Mamoru Endo and Jun-ichi Yoshikawa and Akira Furusawa},
journal= {arXiv preprint arXiv:2204.03736},
year = {2023}
}