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We evaluate the after-pulse probability of a gated-mode single-photon detector operating at 1550 nm. The experimental results are applied to the simulation of quantum key distribution to estimate the obtainable key rate, which decreases at higher gate frequencies because of a large number of after-pulse-related errors. In this paper, we present a postselection method of discarding after-pulses to improve the key rate.
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Yoshizawa et al. (2002) studied this question.
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