Efficient and low-noise single-photon detection in 1550 nm communication band by frequency upconversion in periodically poled LiNbO_3 waveguides
2008; Optica Publishing Group; Volume: 33; Issue: 7 Linguagem: Inglês
10.1364/ol.33.000639
ISSN1539-4794
AutoresH. Kamada, Masaki Asobe, Toshimori Honjo, Hiroki Takesue, Y. Tokura, Y. Nishida, O. Tadanaga, H. Miyazawa,
Tópico(s)Advanced Fiber Laser Technologies
ResumoWe demonstrate 1500 nm band single-photon detection with low dark-count noise and a potentially high efficiency, which may allow long distance and high-bit-rate quantum key distribution. By developing frequency upconversion devices based on periodically poled lithium niobate waveguides, which are specifically designed to use a pump wavelength longer than that of communication-band photons, we completely eliminate the dark-count noise caused by parasitic nonlinear processes in the waveguide. We observed an internal conversion efficiency as high as 40% and demonstrated scaling down to the single photon level while maintaining a background dark-count rate of 10(2)s(-1).
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