Generation of Highly Pure Single-Photon State at Telecommunication Wavelength

• URL: http://arxiv.org/abs/2204.03736v2
• Date: Thu, 16 Jun 2022 09:04:03 GMT
• Title: Generation of Highly Pure Single-Photon State at Telecommunication Wavelength
• Authors: Akito Kawasaki, Kan Takase, Takefumi Nomura, Sigehito Miki, Hirotaka Terai, Masahiro Yabuno, Fumihiro China, Warit Asavanant, Mamoru Endo, Jun-ichi Yoshikawa and Akira Furusawa
• Abstract summary: We generate highly-pure-single-photon states, one of the most primitive non-Gaussian states. The Wigner negativity, the indicator of non-classicality, of the generated single photon state is $-0.228pm0.004$.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: 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.

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