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Conference on Lasers and Electro-Optics Pacific Rim (CLEO-PR)

A 1550 nm single-photon detector for long-distance fiber-optic quantum cryptography

Akio Yoshizawa, Hidemi Tsuchida

Published Nov 13, 2002• 0 citations
Publisher

Abstract

We report a thermoelectrically cooled gated-mode single-photon detector operating at 1550 nm. The obtained quantum efficiency (/spl sim/11.6%) and the dark count probability (/spl sim/2/spl times/10/sup -5/) per gate makes it possible to realize long-distance fiber-optic quantum cryptography with a small quantum bit-error rate.
DOI
10.1109/cleopr.2001.971009

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Abstract We build and test a single-photon detector based on a Si avalanche photodiode Excelitas 30902SH thermoelectrically cooled to −100∘C. Our detector has dark count rate below 1 Hz, 500 μm500\ \mu\mathrm{m}500 μm 500 μ m diameter photosensitive area, photon detection efficiency around 50%, afterpulsing less than 0.35%, and timing jitter under 1 ns. These characteristics make it suitable for long-distance free-space quantum communication links, which we briefly discuss. We also report an improved method that we call long-time afterpulsing analysis, used to determine and visualise long trap lifetimes at different temperatures.
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