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Experimental setup for the DPS-QKD. IM: intensity modulator; PM: phase modulator; ATT: variable attenuator; PPG: pulse pattern generator; MZI: Mach-Zehnder interferometer; TIA: time interval analyzer; : single-photon detectors based on the SG-APD.
Diagram of a single-photon detector using a sinusoidally gated APD. BEF: band elimination filter; LPF: low pass filter.
Histograms of the detected signal at (a) and (b) for a fixed modulation pattern.
Secure key generation rate as function of communication distance. The open and closed circles show the experimental results of the sifted key generation rates and secure key generation rate, respectively. The dotted and solid curves are numerical results of the sifted key generation rates and secure key generation rate, respectively, where we assumed the following conditions: , , , , and a fiber loss of .
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