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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 $-0.228\pm0.004$, corresponded to $85.1\pm0.7\%$ 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., 10 pages, 6 figures

We generate highly-pure single-photon states at the telecommunication wave-length with the best record of the minimum Wigner negativity, paving the way toward the integration of universal quantum computers and constructing quantum networks.

A 55-year-old man was admitted to the hospital with massive melena and shock. He had a history of Dacron Y graft reconstruction for aortoiliac atheroscerotic occlusive disease 10 years before admission. At emergency laparotomy the jejunum was adherent to the graft. After separation a fistulous communication was detected between the two. A longitudinal tear in the stem of the graft was found. The graft was reconstructed with a Gore-Tex (Gore-Tex registered trademark of W.L. Gore & Associates, Inc., Elkton, Md.) patch. His postoperative course was uneventful. (J Vasc Surg 1989;10:554–6.)