Quantum frequency conversion using 4-port fiber-pigtailed PPLN module

Quantum frequency conversion (QFC), which involves the exchange of frequency modes of photons, is a prerequisite for quantum interconnects among various quantum systems, primarily those based on telecom photonic network infrastructures. Compact and fiber-closed QFC modules are in high demand for suc...

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Bibliographic Details
Published in:Optics express 2023-08, Vol.31 (18), p.29271
Main Authors: Murakami, Shoichi, Fujimoto, Rintaro, Kobayashi, Toshiki, Ikuta, Rikizo, Inoue, Asuka, Umeki, Takeshi, Miki, Shigehito, China, Fumihiro, Terai, Hirotaka, Kasahara, Ryoichi, Mukai, Tetsuya, Imoto, Nobuyuki, Yamamoto, Takashi
Format: Article
Language:English
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Summary:Quantum frequency conversion (QFC), which involves the exchange of frequency modes of photons, is a prerequisite for quantum interconnects among various quantum systems, primarily those based on telecom photonic network infrastructures. Compact and fiber-closed QFC modules are in high demand for such applications. In this paper, we report such a QFC module based on a fiber-coupled 4-port frequency converter with a periodically poled lithium niobate (PPLN) waveguide. The demonstrated QFC shifted the wavelength of a single photon from 780 to 1541 nm. The single photon was prepared via spontaneous parametric down-conversion (SPDC) with heralding photon detection, for which the cross-correlation function was 40.45 ± 0.09. The observed cross-correlation function of the photon pairs had a nonclassical value of 13.7 ± 0.4 after QFC at the maximum device efficiency of 0.73, which preserved the quantum statistical property. Such an efficient QFC module is useful for interfacing atomic systems and fiber-optic communication.
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.494313