Quantum key distribution exploits the transmissiondetection of single photons’ quantum states to generatedistribute secure keys, allowing absolutely secure communication. We use a self-developed miniature single-photon source, together with the single-photon wavepacket engineering, to implement a highly efficient protocol of differential-phase-shift quantum key distribution. Using the Ca

Current quantum key distribution suffer from the low efficiency of creating a key bit from a photon. The key creation efficiency is determined, in good part, by the quantum efficiency of single-photon detectors. Our self-developed miniature single-photon source uses monolithic doubly resonant parametric down-conversion to prolong the coherence time of the single photons. Together with the single-p

Quantum key distribution allows the users with the keys to implement the uncrackable symmetric key algorithmsabsolutely secure communication. The technology not only can replace the need of key distribution by courier but also benefits the development of distance unlimited absolutely secure communication networks for the commercialmilitary uses by the government, corporations,militar