Heralding of single photon at 1550 nm from pump pulsed nondegenerate spontaneous parametric downconversion is demonstrated. P(1) and P(2) of the source are 0.1871 and 2.4 × 10−3 respectively, with source triggering at 2.16 × 105 triggers per second. This source may be used in quantum key distribution systems.
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Soujaeff et al. (2007) studied this question.
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