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The detection sensitivity (DS) of the commercial single-photon-receiver basedon InGaAs gate-mode avalanche photodiode is estimated. Instalment of adigital-blanking-system (DBS) to reduce dark current makes the differencebetween DS, which is an efficiency of the detector during its open-gate/activestate, and the total/overall detection efficiency (DE). By numericalsimulations, it is found that the average number of light-pulses, blanked byDBS, following a registered pulse is 0.333. DS is estimated at 0.216, which canbe used for estimating DE for an arbitrary photon arriving rate and a gatingfrequency of the receiver.

Derivation of sensitivity of a Geiger mode APDs detector from a given efficiency for QKD experiments