  In the current research work, an analysis of differential phase shift quantum
key distribution using InGaAs/InP and Silicon-APD (avalanche photodiode) as
single photon detectors is performed. Various performance parameters of
interest such as shifted key rate, secure key rate, and secure communication
distance obtained are investigated. In this optical fiber-based differential
phase shift quantum key distribution, it is observed that Si-APD under
frequency conversion method at telecommunication window outperforms the
InGaAs/InP APD.
