Method and system for generating decoy and signal pulses for quantum key distribution protocol

Abstract

A method for generating decoy and signal pulses for a Decoy differential phase shift (DDPS) quantum key distribution (QKD) protocol includes emitting laser light from a laser source and modulating intensity of the laser light using at least one intensity modulator. The intensity of the laser light is modulated to generate the decoy pulses having a first mean photon number (MPN) and the signal pulses having a second MPN greater than the first MPN. The first and second MPNs are associated with the operation of the at least one intensity modulator operable based on a first quantum random number generator (QRNG). The method further includes modulating phase of the decoy and signal pulses using a phase modulator operable based on a second QRNG, and attenuating the modulated decoy and signal pulses, using at least one attenuator, for being transmitted under the DDPS QKD protocol.

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